Skeletal System Anatomy Quiz

1. Which type of bone tissue forms the diaphysis of long bones?

• Spongy (trabecular) bone

  The diaphysis of long bones is composed of compact (dense) bone. This tissue is organized into osteons, also known as Haversian systems. Spongy bone is located primarily in the epiphyses.

• Compact bone

  The diaphysis of long bones is composed of compact (dense) bone. This tissue is organized into osteons, also known as Haversian systems. Spongy bone is located primarily in the epiphyses.

• Woven bone tissue

  The diaphysis of long bones is composed of compact (dense) bone. This tissue is organized into osteons, also known as Haversian systems. Spongy bone is located primarily in the epiphyses.

• Lamellar reticulofibrous bone tissue

  The diaphysis of long bones is composed of compact (dense) bone. This tissue is organized into osteons, also known as Haversian systems. Spongy bone is located primarily in the epiphyses.

• I find it difficult to answer

  The diaphysis of long bones is composed of compact (dense) bone. This tissue is organized into osteons, also known as Haversian systems. Spongy bone is located primarily in the epiphyses.

2. Which component nourishes articular cartilage in a synovial joint?

• Periosteum

  Articular hyaline cartilage lacks blood vessels and nerves. It receives nutrients by diffusion from synovial fluid, which is produced by the synovial membrane of the joint capsule.

• Synovial fluid

  Articular hyaline cartilage lacks blood vessels and nerves. It receives nutrients by diffusion from synovial fluid, which is produced by the synovial membrane of the joint capsule.

• Subchondral bone

  Articular hyaline cartilage lacks blood vessels and nerves. It receives nutrients by diffusion from synovial fluid, which is produced by the synovial membrane of the joint capsule.

• Intraarticular ligaments

  Articular hyaline cartilage lacks blood vessels and nerves. It receives nutrients by diffusion from synovial fluid, which is produced by the synovial membrane of the joint capsule.

• I find it difficult to answer

  Articular hyaline cartilage lacks blood vessels and nerves. It receives nutrients by diffusion from synovial fluid, which is produced by the synovial membrane of the joint capsule.

3. Which bone connection is classified as a synchondrosis?

• Pubic symphysis

  The joint between the first costal cartilage and the sternum is a synchondrosis. This is a continuous cartilaginous connection formed by hyaline cartilage, with no joint cavity.

• Sternoclavicular joint

  The joint between the first costal cartilage and the sternum is a synchondrosis. This is a continuous cartilaginous connection formed by hyaline cartilage, with no joint cavity.

• First sternocostal joint

  The joint between the first costal cartilage and the sternum is a synchondrosis. This is a continuous cartilaginous connection formed by hyaline cartilage, with no joint cavity.

• Sacroiliac joint

  The joint between the first costal cartilage and the sternum is a synchondrosis. This is a continuous cartilaginous connection formed by hyaline cartilage, with no joint cavity.

• I find it difficult to answer

  The joint between the first costal cartilage and the sternum is a synchondrosis. This is a continuous cartilaginous connection formed by hyaline cartilage, with no joint cavity.

4. Which vertebrae have transverse foramina in their transverse processes?

• Thoracic vertebrae

  Transverse foramina in the transverse processes are a characteristic feature of cervical vertebrae (C1–C7). The vertebral artery and vein pass through these foramina at the C1–C6 levels.

• Lumbar vertebrae

  Transverse foramina in the transverse processes are a characteristic feature of cervical vertebrae (C1–C7). The vertebral artery and vein pass through these foramina at the C1–C6 levels.

• Cervical vertebrae

  Transverse foramina in the transverse processes are a characteristic feature of cervical vertebrae (C1–C7). The vertebral artery and vein pass through these foramina at the C1–C6 levels.

• Sacral vertebrae

  Transverse foramina in the transverse processes are a characteristic feature of cervical vertebrae (C1–C7). The vertebral artery and vein pass through these foramina at the C1–C6 levels.

• I find it difficult to answer

  Transverse foramina in the transverse processes are a characteristic feature of cervical vertebrae (C1–C7). The vertebral artery and vein pass through these foramina at the C1–C6 levels.

5. Which bone forms the medial malleolus?

• Fibula

  The medial malleolus is the distal bony projection of the tibia. The lateral malleolus is formed by the distal end of the fibula.

• Tibia

  The medial malleolus is the distal bony projection of the tibia. The lateral malleolus is formed by the distal end of the fibula.

• Talus

  The medial malleolus is the distal bony projection of the tibia. The lateral malleolus is formed by the distal end of the fibula.

• Calcaneus

  The medial malleolus is the distal bony projection of the tibia. The lateral malleolus is formed by the distal end of the fibula.

• I find it difficult to answer

  The medial malleolus is the distal bony projection of the tibia. The lateral malleolus is formed by the distal end of the fibula.

6. Rupture of which knee ligament causes posterior displacement of the tibia, producing a positive posterior drawer sign?

• Anterior cruciate ligament

  The posterior cruciate ligament prevents posterior displacement of the tibia relative to the femur. When the posterior cruciate ligament is damaged or torn, posterior stability of the knee is lost, and the tibia can shift backward when the knee is flexed. This is called a positive posterior drawer sign. By contrast, rupture of the anterior cruciate ligament causes anterior displacement of the tibia, producing a positive anterior drawer sign.

• Posterior cruciate ligament

  The posterior cruciate ligament prevents posterior displacement of the tibia relative to the femur. When the posterior cruciate ligament is damaged or torn, posterior stability of the knee is lost, and the tibia can shift backward when the knee is flexed. This is called a positive posterior drawer sign. By contrast, rupture of the anterior cruciate ligament causes anterior displacement of the tibia, producing a positive anterior drawer sign.

• Tibial collateral ligament

  The posterior cruciate ligament prevents posterior displacement of the tibia relative to the femur. When the posterior cruciate ligament is damaged or torn, posterior stability of the knee is lost, and the tibia can shift backward when the knee is flexed. This is called a positive posterior drawer sign. By contrast, rupture of the anterior cruciate ligament causes anterior displacement of the tibia, producing a positive anterior drawer sign.

• Fibular collateral ligament

  The posterior cruciate ligament prevents posterior displacement of the tibia relative to the femur. When the posterior cruciate ligament is damaged or torn, posterior stability of the knee is lost, and the tibia can shift backward when the knee is flexed. This is called a positive posterior drawer sign. By contrast, rupture of the anterior cruciate ligament causes anterior displacement of the tibia, producing a positive anterior drawer sign.

• I find it difficult to answer

  The posterior cruciate ligament prevents posterior displacement of the tibia relative to the femur. When the posterior cruciate ligament is damaged or torn, posterior stability of the knee is lost, and the tibia can shift backward when the knee is flexed. This is called a positive posterior drawer sign. By contrast, rupture of the anterior cruciate ligament causes anterior displacement of the tibia, producing a positive anterior drawer sign.

7. Which canal in compact bone contains blood vessels and nerves and is surrounded by concentric bone lamellae?

• Volkmann’s canal

  The Haversian canal, or central canal of an osteon, is a longitudinal canal in compact bone. It is surrounded by 5–20 concentric bone lamellae, which together form the structural unit known as an osteon. Volkmann’s canals run transversely and connect Haversian canals with one another.

• Haversian canal

  The Haversian canal, or central canal of an osteon, is a longitudinal canal in compact bone. It is surrounded by 5–20 concentric bone lamellae, which together form the structural unit known as an osteon. Volkmann’s canals run transversely and connect Haversian canals with one another.

• Medullary canal

  The Haversian canal, or central canal of an osteon, is a longitudinal canal in compact bone. It is surrounded by 5–20 concentric bone lamellae, which together form the structural unit known as an osteon. Volkmann’s canals run transversely and connect Haversian canals with one another.

• Periosteal canal

  The Haversian canal, or central canal of an osteon, is a longitudinal canal in compact bone. It is surrounded by 5–20 concentric bone lamellae, which together form the structural unit known as an osteon. Volkmann’s canals run transversely and connect Haversian canals with one another.

• I find it difficult to answer

  The Haversian canal, or central canal of an osteon, is a longitudinal canal in compact bone. It is surrounded by 5–20 concentric bone lamellae, which together form the structural unit known as an osteon. Volkmann’s canals run transversely and connect Haversian canals with one another.

8. Which carpal bones directly participate in forming the radiocarpal joint?

• Scaphoid, lunate, triquetrum, and pisiform

  The articular surfaces of three bones in the proximal carpal row participate in forming the radiocarpal joint: the scaphoid, lunate, and triquetrum. Although the pisiform is located in the proximal carpal row, it is a sesamoid bone and does not participate in forming the radiocarpal joint. It rests on the triquetrum and articulates only with it.

• Scaphoid, lunate, and triquetrum

  The articular surfaces of three bones in the proximal carpal row participate in forming the radiocarpal joint: the scaphoid, lunate, and triquetrum. Although the pisiform is located in the proximal carpal row, it is a sesamoid bone and does not participate in forming the radiocarpal joint. It rests on the triquetrum and articulates only with it.

• Trapezium, trapezoid, capitate, and hamate

  The articular surfaces of three bones in the proximal carpal row participate in forming the radiocarpal joint: the scaphoid, lunate, and triquetrum. Although the pisiform is located in the proximal carpal row, it is a sesamoid bone and does not participate in forming the radiocarpal joint. It rests on the triquetrum and articulates only with it.

• Scaphoid and lunate only

  The articular surfaces of three bones in the proximal carpal row participate in forming the radiocarpal joint: the scaphoid, lunate, and triquetrum. Although the pisiform is located in the proximal carpal row, it is a sesamoid bone and does not participate in forming the radiocarpal joint. It rests on the triquetrum and articulates only with it.

• I find it difficult to answer

  The articular surfaces of three bones in the proximal carpal row participate in forming the radiocarpal joint: the scaphoid, lunate, and triquetrum. Although the pisiform is located in the proximal carpal row, it is a sesamoid bone and does not participate in forming the radiocarpal joint. It rests on the triquetrum and articulates only with it.

9. Which part of the skeleton belongs to the appendicular skeleton?

• Thoracic cage

  The appendicular skeleton includes the bones of the limb girdles and the free parts of the upper and lower limbs. The axial skeleton consists of the skull, vertebral column, and thoracic cage.

• Vertebral column

  The appendicular skeleton includes the bones of the limb girdles and the free parts of the upper and lower limbs. The axial skeleton consists of the skull, vertebral column, and thoracic cage.

• Bones of the free lower limb

  The appendicular skeleton includes the bones of the limb girdles and the free parts of the upper and lower limbs. The axial skeleton consists of the skull, vertebral column, and thoracic cage.

• Bones of the skull

  The appendicular skeleton includes the bones of the limb girdles and the free parts of the upper and lower limbs. The axial skeleton consists of the skull, vertebral column, and thoracic cage.

• I find it difficult to answer

  The appendicular skeleton includes the bones of the limb girdles and the free parts of the upper and lower limbs. The axial skeleton consists of the skull, vertebral column, and thoracic cage.

10. What is the process called in which the cartilage model of a bone is replaced by bone tissue during development?

• Intramembranous ossification

  Endochondral ossification is the process in which the cartilage model of a bone is gradually replaced by bone tissue through the formation of primary and secondary ossification centers. Intramembranous ossification occurs directly from mesenchyme, without a cartilage stage.

• Endochondral ossification

  Endochondral ossification is the process in which the cartilage model of a bone is gradually replaced by bone tissue through the formation of primary and secondary ossification centers. Intramembranous ossification occurs directly from mesenchyme, without a cartilage stage.

• Periosteal ossification

  Endochondral ossification is the process in which the cartilage model of a bone is gradually replaced by bone tissue through the formation of primary and secondary ossification centers. Intramembranous ossification occurs directly from mesenchyme, without a cartilage stage.

• Endosteal resorption

  Endochondral ossification is the process in which the cartilage model of a bone is gradually replaced by bone tissue through the formation of primary and secondary ossification centers. Intramembranous ossification occurs directly from mesenchyme, without a cartilage stage.

• I find it difficult to answer

  Endochondral ossification is the process in which the cartilage model of a bone is gradually replaced by bone tissue through the formation of primary and secondary ossification centers. Intramembranous ossification occurs directly from mesenchyme, without a cartilage stage.

11. Which bone does not form part of the acetabulum?

• Ilium

  The acetabulum is formed by three parts of the hip bone: the ilium, ischium, and pubis. The ilium forms the superior 2/5, the ischium forms the posteroinferior 2/5, and the pubis forms the anteroinferior 1/5. The sacrum does not participate in forming the acetabulum.

• Ischium

  The acetabulum is formed by three parts of the hip bone: the ilium, ischium, and pubis. The ilium forms the superior 2/5, the ischium forms the posteroinferior 2/5, and the pubis forms the anteroinferior 1/5. The sacrum does not participate in forming the acetabulum.

• Pubis

  The acetabulum is formed by three parts of the hip bone: the ilium, ischium, and pubis. The ilium forms the superior 2/5, the ischium forms the posteroinferior 2/5, and the pubis forms the anteroinferior 1/5. The sacrum does not participate in forming the acetabulum.

• Sacrum

  The acetabulum is formed by three parts of the hip bone: the ilium, ischium, and pubis. The ilium forms the superior 2/5, the ischium forms the posteroinferior 2/5, and the pubis forms the anteroinferior 1/5. The sacrum does not participate in forming the acetabulum.

• I find it difficult to answer

  The acetabulum is formed by three parts of the hip bone: the ilium, ischium, and pubis. The ilium forms the superior 2/5, the ischium forms the posteroinferior 2/5, and the pubis forms the anteroinferior 1/5. The sacrum does not participate in forming the acetabulum.

12. What characterizes an amphiarthrosis as a type of bone connection?

• Complete absence of a joint cavity and significant mobility

  An amphiarthrosis is a tight joint. It has a joint cavity and a synovial membrane, but mobility is very limited because of short, taut articular ligaments and congruent articular surfaces. Example: the sacroiliac joint.

• Presence of a joint cavity with minimal mobility due to short, taut ligaments

  An amphiarthrosis is a tight joint. It has a joint cavity and a synovial membrane, but mobility is very limited because of short, taut articular ligaments and congruent articular surfaces. Example: the sacroiliac joint.

• Connection by hyaline cartilage with no mobility

  An amphiarthrosis is a tight joint. It has a joint cavity and a synovial membrane, but mobility is very limited because of short, taut articular ligaments and congruent articular surfaces. Example: the sacroiliac joint.

• Synovial joint with several axes of movement

  An amphiarthrosis is a tight joint. It has a joint cavity and a synovial membrane, but mobility is very limited because of short, taut articular ligaments and congruent articular surfaces. Example: the sacroiliac joint.

• I find it difficult to answer

  An amphiarthrosis is a tight joint. It has a joint cavity and a synovial membrane, but mobility is very limited because of short, taut articular ligaments and congruent articular surfaces. Example: the sacroiliac joint.

13. Which of the listed joints is a saddle joint?

• Second metacarpophalangeal joint of the hand

  The carpometacarpal joint of the thumb is a classic saddle joint. Its articular surfaces are saddle-shaped and allow movement around two axes: flexion and extension, abduction and adduction. This joint also permits opposition.

• Carpometacarpal joint of the thumb

  The carpometacarpal joint of the thumb is a classic saddle joint. Its articular surfaces are saddle-shaped and allow movement around two axes: flexion and extension, abduction and adduction. This joint also permits opposition.

• Proximal interphalangeal joint of the second toe

  The carpometacarpal joint of the thumb is a classic saddle joint. Its articular surfaces are saddle-shaped and allow movement around two axes: flexion and extension, abduction and adduction. This joint also permits opposition.

• Radiocarpal joint

  The carpometacarpal joint of the thumb is a classic saddle joint. Its articular surfaces are saddle-shaped and allow movement around two axes: flexion and extension, abduction and adduction. This joint also permits opposition.

• I find it difficult to answer

  The carpometacarpal joint of the thumb is a classic saddle joint. Its articular surfaces are saddle-shaped and allow movement around two axes: flexion and extension, abduction and adduction. This joint also permits opposition.

14. What type of cartilage covers the articular surfaces of most synovial joints?

• Fibrocartilage

  The articular surfaces of most synovial joints are covered with hyaline cartilage, which provides a smooth gliding surface and cushioning.

• Elastic cartilage

  The articular surfaces of most synovial joints are covered with hyaline cartilage, which provides a smooth gliding surface and cushioning.

• Hyaline cartilage

  The articular surfaces of most synovial joints are covered with hyaline cartilage, which provides a smooth gliding surface and cushioning.

• Secondary cartilage

  The articular surfaces of most synovial joints are covered with hyaline cartilage, which provides a smooth gliding surface and cushioning.

• I find it difficult to answer

  The articular surfaces of most synovial joints are covered with hyaline cartilage, which provides a smooth gliding surface and cushioning.

15. How many bones normally make up the adult human skeleton?

• About 350 bones

  The adult human skeleton normally consists of approximately 206 bones. A newborn has about 270–300 cartilaginous and bony elements, which fuse during development. The exact number can vary slightly because of sesamoid and accessory bones.

• About 270 bones

  The adult human skeleton normally consists of approximately 206 bones. A newborn has about 270–300 cartilaginous and bony elements, which fuse during development. The exact number can vary slightly because of sesamoid and accessory bones.

• About 206 bones

  The adult human skeleton normally consists of approximately 206 bones. A newborn has about 270–300 cartilaginous and bony elements, which fuse during development. The exact number can vary slightly because of sesamoid and accessory bones.

• About 180 bones

  The adult human skeleton normally consists of approximately 206 bones. A newborn has about 270–300 cartilaginous and bony elements, which fuse during development. The exact number can vary slightly because of sesamoid and accessory bones.

• I find it difficult to answer

  The adult human skeleton normally consists of approximately 206 bones. A newborn has about 270–300 cartilaginous and bony elements, which fuse during development. The exact number can vary slightly because of sesamoid and accessory bones.

16. What is the epiphyseal plate, or growth plate?

• A layer of compact bone separating the epiphysis from the diaphysis

  The epiphyseal plate, also called the growth plate or physis, is a zone of hyaline cartilage located between the epiphysis and metaphysis of long bones. Chondrocyte proliferation in this zone enables longitudinal bone growth until skeletal maturity.

• A layer of hyaline cartilage between the epiphysis and metaphysis that enables longitudinal bone growth

  The epiphyseal plate, also called the growth plate or physis, is a zone of hyaline cartilage located between the epiphysis and metaphysis of long bones. Chondrocyte proliferation in this zone enables longitudinal bone growth until skeletal maturity.

• Fibrocartilage lining the articular surface of the epiphysis

  The epiphyseal plate, also called the growth plate or physis, is a zone of hyaline cartilage located between the epiphysis and metaphysis of long bones. Chondrocyte proliferation in this zone enables longitudinal bone growth until skeletal maturity.

• A periosteal layer at the tendon attachment site

  The epiphyseal plate, also called the growth plate or physis, is a zone of hyaline cartilage located between the epiphysis and metaphysis of long bones. Chondrocyte proliferation in this zone enables longitudinal bone growth until skeletal maturity.

• I find it difficult to answer

  The epiphyseal plate, also called the growth plate or physis, is a zone of hyaline cartilage located between the epiphysis and metaphysis of long bones. Chondrocyte proliferation in this zone enables longitudinal bone growth until skeletal maturity.

17. Which of the following joints is an ellipsoid joint?

• Hip joint

  The radiocarpal joint is an ellipsoid joint. Its articular head is ellipsoid, and the articular fossa has a corresponding shape. Movements are possible along two axes: flexion and extension, and abduction and adduction. The ankle joint is a hinge joint, the hip joint is a ball-and-socket joint, and the sternoclavicular joint is a saddle joint.

• Radiocarpal joint

  The radiocarpal joint is an ellipsoid joint. Its articular head is ellipsoid, and the articular fossa has a corresponding shape. Movements are possible along two axes: flexion and extension, and abduction and adduction. The ankle joint is a hinge joint, the hip joint is a ball-and-socket joint, and the sternoclavicular joint is a saddle joint.

• Ankle joint

  The radiocarpal joint is an ellipsoid joint. Its articular head is ellipsoid, and the articular fossa has a corresponding shape. Movements are possible along two axes: flexion and extension, and abduction and adduction. The ankle joint is a hinge joint, the hip joint is a ball-and-socket joint, and the sternoclavicular joint is a saddle joint.

• Sternoclavicular joint

  The radiocarpal joint is an ellipsoid joint. Its articular head is ellipsoid, and the articular fossa has a corresponding shape. Movements are possible along two axes: flexion and extension, and abduction and adduction. The ankle joint is a hinge joint, the hip joint is a ball-and-socket joint, and the sternoclavicular joint is a saddle joint.

• I find it difficult to answer

  The radiocarpal joint is an ellipsoid joint. Its articular head is ellipsoid, and the articular fossa has a corresponding shape. Movements are possible along two axes: flexion and extension, and abduction and adduction. The ankle joint is a hinge joint, the hip joint is a ball-and-socket joint, and the sternoclavicular joint is a saddle joint.

18. Which group of bones forms the cranial vault, or calvaria, and consists mainly of flat bones?

• Frontal bone, parietal bones, squamous part of the occipital bone, and squamous parts of the temporal bones

  The cranial vault, or calvaria, is formed by the squamous part of the frontal bone, the two parietal bones, the squamous part of the occipital bone, and the squamous parts of the temporal bones. These flat bones are joined by sutures and protect the brain from above and the sides.

• Sphenoid, ethmoid, and frontal bones

  The cranial vault, or calvaria, is formed by the squamous part of the frontal bone, the two parietal bones, the squamous part of the occipital bone, and the squamous parts of the temporal bones. These flat bones are joined by sutures and protect the brain from above and the sides.

• Petrous part of the temporal bone, basilar part of the occipital bone, and sphenoid bone

  The cranial vault, or calvaria, is formed by the squamous part of the frontal bone, the two parietal bones, the squamous part of the occipital bone, and the squamous parts of the temporal bones. These flat bones are joined by sutures and protect the brain from above and the sides.

• Parietal, zygomatic, and nasal bones

  The cranial vault, or calvaria, is formed by the squamous part of the frontal bone, the two parietal bones, the squamous part of the occipital bone, and the squamous parts of the temporal bones. These flat bones are joined by sutures and protect the brain from above and the sides.

• I find it difficult to answer

  The cranial vault, or calvaria, is formed by the squamous part of the frontal bone, the two parietal bones, the squamous part of the occipital bone, and the squamous parts of the temporal bones. These flat bones are joined by sutures and protect the brain from above and the sides.

19. Which of the listed functions is NOT a primary function of the human skeleton?

• Support and protection

  The skeleton performs mechanical functions, including support, protection of internal organs, and locomotion. It also has biological functions: red bone marrow is involved in hematopoiesis, and bone tissue serves as a reservoir for minerals, including calcium and phosphorus. However, the synthesis and secretion of digestive enzymes and hormones are functions of the digestive organs, including the stomach, pancreas, and intestines, as well as endocrine glands, not the skeleton.

• Hematopoiesis, or blood cell formation

  The skeleton performs mechanical functions, including support, protection of internal organs, and locomotion. It also has biological functions: red bone marrow is involved in hematopoiesis, and bone tissue serves as a reservoir for minerals, including calcium and phosphorus. However, the synthesis and secretion of digestive enzymes and hormones are functions of the digestive organs, including the stomach, pancreas, and intestines, as well as endocrine glands, not the skeleton.

• Synthesis and secretion of digestive hormones

  The skeleton performs mechanical functions, including support, protection of internal organs, and locomotion. It also has biological functions: red bone marrow is involved in hematopoiesis, and bone tissue serves as a reservoir for minerals, including calcium and phosphorus. However, the synthesis and secretion of digestive enzymes and hormones are functions of the digestive organs, including the stomach, pancreas, and intestines, as well as endocrine glands, not the skeleton.

• Mineral storage, including calcium and phosphorus

  The skeleton performs mechanical functions, including support, protection of internal organs, and locomotion. It also has biological functions: red bone marrow is involved in hematopoiesis, and bone tissue serves as a reservoir for minerals, including calcium and phosphorus. However, the synthesis and secretion of digestive enzymes and hormones are functions of the digestive organs, including the stomach, pancreas, and intestines, as well as endocrine glands, not the skeleton.

• I find it difficult to answer

  The skeleton performs mechanical functions, including support, protection of internal organs, and locomotion. It also has biological functions: red bone marrow is involved in hematopoiesis, and bone tissue serves as a reservoir for minerals, including calcium and phosphorus. However, the synthesis and secretion of digestive enzymes and hormones are functions of the digestive organs, including the stomach, pancreas, and intestines, as well as endocrine glands, not the skeleton.

20. What is the structural unit of bone?

• Red bone marrow

  The osteon is the structural and functional unit of compact bone. It consists of concentric cylindrical bone lamellae arranged around a central, or Haversian, canal that contains blood vessels and nerves.

• Ossein

  The osteon is the structural and functional unit of compact bone. It consists of concentric cylindrical bone lamellae arranged around a central, or Haversian, canal that contains blood vessels and nerves.

• Osteon

  The osteon is the structural and functional unit of compact bone. It consists of concentric cylindrical bone lamellae arranged around a central, or Haversian, canal that contains blood vessels and nerves.

• Osteocyte

  The osteon is the structural and functional unit of compact bone. It consists of concentric cylindrical bone lamellae arranged around a central, or Haversian, canal that contains blood vessels and nerves.

• I find it difficult to answer

  The osteon is the structural and functional unit of compact bone. It consists of concentric cylindrical bone lamellae arranged around a central, or Haversian, canal that contains blood vessels and nerves.