Test on the anatomy of the musculocutaneous nerve

Evaluate the knowledge of musculocutaneous nerve anatomy. The test thoroughly evaluates its topography, branches, innervated muscles, and the skin areas on the arm.

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1. From which cord of the brachial plexus does the musculocutaneous nerve originate?

Posterior

The musculocutaneous nerve (n. musculocutaneus) is formed from the lateral cord of the brachial plexus (fibers C5-C7).
Medial

The musculocutaneous nerve (n. musculocutaneus) is formed from the lateral cord of the brachial plexus (fibers C5-C7).
Lateral

The musculocutaneous nerve (n. musculocutaneus) is formed from the lateral cord of the brachial plexus (fibers C5-C7).
Anterior

The musculocutaneous nerve (n. musculocutaneus) is formed from the lateral cord of the brachial plexus (fibers C5-C7).
I find it difficult to answer

The musculocutaneous nerve (n. musculocutaneus) is formed from the lateral cord of the brachial plexus (fibers C5-C7).

2. Which muscle is pierced by the musculocutaneous nerve on its course in the arm?

The biceps brachii

The nerve classically penetrates the coracobrachialis muscle belly (m. coracobrachialis), heading towards the anterior compartment of the arm.
Coracobrachialis muscle

The nerve classically penetrates the coracobrachialis muscle belly (m. coracobrachialis), heading towards the anterior compartment of the arm.
The brachialis muscle

The nerve classically penetrates the coracobrachialis muscle belly (m. coracobrachialis), heading towards the anterior compartment of the arm.
Triceps brachii muscle

The nerve classically penetrates the coracobrachialis muscle belly (m. coracobrachialis), heading towards the anterior compartment of the arm.
I find it difficult to answer

The nerve classically penetrates the coracobrachialis muscle belly (m. coracobrachialis), heading towards the anterior compartment of the arm.

3. Between which muscles is the musculocutaneous nerve located in the middle third of the arm?

Between the brachialis and the triceps

Passing through the coracobrachialis muscle, the nerve descends between m. biceps brachii and m. brachialis.
Between the coracobrachialis and the short head of the biceps

Passing through the coracobrachialis muscle, the nerve descends between m. biceps brachii and m. brachialis.
Under the fascia over the biceps brachii

Passing through the coracobrachialis muscle, the nerve descends between m. biceps brachii and m. brachialis.
Between the biceps brachii and brachialis muscles

Passing through the coracobrachialis muscle, the nerve descends between m. biceps brachii and m. brachialis.
I find it difficult to answer

Passing through the coracobrachialis muscle, the nerve descends between m. biceps brachii and m. brachialis.

4. Which of the following muscles is NOT innervated by the musculocutaneous nerve?

Brachioradialis muscle

The brachioradialis muscle (m. brachioradialis) is innervated by the radial nerve, while the others belong to the anterior group and are innervated by the musculocutaneous.
Brachialis muscle

The brachioradialis muscle (m. brachioradialis) is innervated by the radial nerve, while the others belong to the anterior group and are innervated by the musculocutaneous.
Biceps brachii

The brachioradialis muscle (m. brachioradialis) is innervated by the radial nerve, while the others belong to the anterior group and are innervated by the musculocutaneous.
Coracobrachialis muscle

The brachioradialis muscle (m. brachioradialis) is innervated by the radial nerve, while the others belong to the anterior group and are innervated by the musculocutaneous.
I find it difficult to answer

The brachioradialis muscle (m. brachioradialis) is innervated by the radial nerve, while the others belong to the anterior group and are innervated by the musculocutaneous.

5. The lateral antebrachial cutaneous nerve is a branch of which nerve?

Radial

The lateral antebrachial cutaneous nerve (n. cutaneus antebrachii lateralis) is the terminal sensory continuation of the musculocutaneous nerve.
Median

The lateral antebrachial cutaneous nerve (n. cutaneus antebrachii lateralis) is the terminal sensory continuation of the musculocutaneous nerve.
Musculocutaneous

The lateral antebrachial cutaneous nerve (n. cutaneus antebrachii lateralis) is the terminal sensory continuation of the musculocutaneous nerve.
Ulnar

The lateral antebrachial cutaneous nerve (n. cutaneus antebrachii lateralis) is the terminal sensory continuation of the musculocutaneous nerve.
I find it difficult to answer

The lateral antebrachial cutaneous nerve (n. cutaneus antebrachii lateralis) is the terminal sensory continuation of the musculocutaneous nerve.

6. Which skin area does the terminal branch of the musculocutaneous nerve innervate?

Skin of the medial surface of the forearm

N. cutaneus antebrachii lateralis provides sensory innervation to the radial (lateral) edge of the forearm.
Skin of the lateral surface of the forearm

N. cutaneus antebrachii lateralis provides sensory innervation to the radial (lateral) edge of the forearm.
Skin of the posterior surface of the arm

N. cutaneus antebrachii lateralis provides sensory innervation to the radial (lateral) edge of the forearm.
Skin of the palmar surface of the hand

N. cutaneus antebrachii lateralis provides sensory innervation to the radial (lateral) edge of the forearm.
I find it difficult to answer

N. cutaneus antebrachii lateralis provides sensory innervation to the radial (lateral) edge of the forearm.

7. From the fibers of which spinal nerves does the musculocutaneous nerve predominantly consist?

C8-T1

The musculocutaneous nerve carries motor and sensory fibers from the anterior branches of the fifth, sixth, and seventh cervical spinal nerves (C5-C7).
C3-C5

The musculocutaneous nerve carries motor and sensory fibers from the anterior branches of the fifth, sixth, and seventh cervical spinal nerves (C5-C7).
C7-T1

The musculocutaneous nerve carries motor and sensory fibers from the anterior branches of the fifth, sixth, and seventh cervical spinal nerves (C5-C7).
C5-C7

The musculocutaneous nerve carries motor and sensory fibers from the anterior branches of the fifth, sixth, and seventh cervical spinal nerves (C5-C7).
I find it difficult to answer

The musculocutaneous nerve carries motor and sensory fibers from the anterior branches of the fifth, sixth, and seventh cervical spinal nerves (C5-C7).

8. Where does the musculocutaneous nerve emerge from beneath the lateral edge of the biceps brachii to become subcutaneous?

Just above the cubital fossa

The nerve emerges from beneath the lateral edge of the m. biceps brachii, piercing the fascia of the arm directly above the elbow bend.
At the level of the surgical neck of the humerus

The nerve emerges from beneath the lateral edge of the m. biceps brachii, piercing the fascia of the arm directly above the elbow bend.
In the lower third of the forearm

The nerve emerges from beneath the lateral edge of the m. biceps brachii, piercing the fascia of the arm directly above the elbow bend.
In the wrist area

The nerve emerges from beneath the lateral edge of the m. biceps brachii, piercing the fascia of the arm directly above the elbow bend.
I find it difficult to answer

The nerve emerges from beneath the lateral edge of the m. biceps brachii, piercing the fascia of the arm directly above the elbow bend.

9. Which capsule of a joint is innervated by the articular branches of the musculocutaneous nerve?

Glenohumeral joint

On the arm, the musculocutaneous nerve gives small articular branches to the anterior surface of the elbow joint capsule.
Elbow joint

On the arm, the musculocutaneous nerve gives small articular branches to the anterior surface of the elbow joint capsule.
Radiocarpal joint

On the arm, the musculocutaneous nerve gives small articular branches to the anterior surface of the elbow joint capsule.
Acromioclavicular joint

On the arm, the musculocutaneous nerve gives small articular branches to the anterior surface of the elbow joint capsule.
I find it difficult to answer

On the arm, the musculocutaneous nerve gives small articular branches to the anterior surface of the elbow joint capsule.

10. In relation to the axillary artery, how is the musculocutaneous nerve positioned in the axillary fossa?

Medially

In the lateral cord and at its origin, the nerve is located outside (laterally) from the axillary artery (a. axillaris).
Posteriorly

In the lateral cord and at its origin, the nerve is located outside (laterally) from the axillary artery (a. axillaris).
Laterally

In the lateral cord and at its origin, the nerve is located outside (laterally) from the axillary artery (a. axillaris).
Anteriorly

In the lateral cord and at its origin, the nerve is located outside (laterally) from the axillary artery (a. axillaris).
I find it difficult to answer

In the lateral cord and at its origin, the nerve is located outside (laterally) from the axillary artery (a. axillaris).

11. With which subcutaneous vein does the lateral antebrachial cutaneous nerve often run alongside?

Cephalic vein (v. cephalica)

In the forearm, n. cutaneus antebrachii lateralis descends in the subcutaneous tissue, often accompanying v. cephalica.
Medial basilic vein (v. basilica)

In the forearm, n. cutaneus antebrachii lateralis descends in the subcutaneous tissue, often accompanying v. cephalica.
Median cubital vein (v. cephalic)

In the forearm, n. cutaneus antebrachii lateralis descends in the subcutaneous tissue, often accompanying v. cephalica.
Brachial vein (v. brachialis)

In the forearm, n. cutaneus antebrachii lateralis descends in the subcutaneous tissue, often accompanying v. cephalica.
I find it difficult to answer

In the forearm, n. cutaneus antebrachii lateralis descends in the subcutaneous tissue, often accompanying v. cephalica.

12. Innervation of the brachialis muscle (m. brachialis) has a dual nature. Besides the musculocutaneous, which nerve participates in its innervation?

Median nerve

The lateral portion of the brachialis muscle often receives additional innervation from the radial nerve (n. radialis).
Ulnar nerve

The lateral portion of the brachialis muscle often receives additional innervation from the radial nerve (n. radialis).
Axillary nerve

The lateral portion of the brachialis muscle often receives additional innervation from the radial nerve (n. radialis).
Radial nerve

The lateral portion of the brachialis muscle often receives additional innervation from the radial nerve (n. radialis).
I find it difficult to answer

The lateral portion of the brachialis muscle often receives additional innervation from the radial nerve (n. radialis).

13. With which nerve can the musculocutaneous nerve have a connecting branch (anastomosis) in the lower third of the arm?

With the ulnar nerve

An anatomical norm found in some individuals is the presence of a communicant branch between the musculocutaneous and median nerves in the arm.
With the median nerve

An anatomical norm found in some individuals is the presence of a communicant branch between the musculocutaneous and median nerves in the arm.
With the subscapular nerve

An anatomical norm found in some individuals is the presence of a communicant branch between the musculocutaneous and median nerves in the arm.
With the radial nerve

An anatomical norm found in some individuals is the presence of a communicant branch between the musculocutaneous and median nerves in the arm.
I find it difficult to answer

An anatomical norm found in some individuals is the presence of a communicant branch between the musculocutaneous and median nerves in the arm.

14. When emerging from the interscalene gap, the fibers forming the musculocutaneous nerve run as part of:

Lower trunk

The C5-C7 fibers run as part of the upper (C5-C6) and middle (C7) trunks of the brachial plexus, forming the lateral cord.
Only middle trunk

The C5-C7 fibers run as part of the upper (C5-C6) and middle (C7) trunks of the brachial plexus, forming the lateral cord.
Upper and middle trunks

The C5-C7 fibers run as part of the upper (C5-C6) and middle (C7) trunks of the brachial plexus, forming the lateral cord.
Medial cord

The C5-C7 fibers run as part of the upper (C5-C6) and middle (C7) trunks of the brachial plexus, forming the lateral cord.
I find it difficult to answer

The C5-C7 fibers run as part of the upper (C5-C6) and middle (C7) trunks of the brachial plexus, forming the lateral cord.

15. Which function of the biceps brachii is affected when the musculocutaneous nerve is damaged?

Flexion and supination of the forearm

The biceps brachii, innervated by the musculocutaneous nerve, is a powerful supinator and flexor of the forearm.
Extension and pronation of the forearm

The biceps brachii, innervated by the musculocutaneous nerve, is a powerful supinator and flexor of the forearm.
Abduction of the arm

The biceps brachii, innervated by the musculocutaneous nerve, is a powerful supinator and flexor of the forearm.
Adduction and internal rotation of the arm

The biceps brachii, innervated by the musculocutaneous nerve, is a powerful supinator and flexor of the forearm.
I find it difficult to answer

The biceps brachii, innervated by the musculocutaneous nerve, is a powerful supinator and flexor of the forearm.

16. How is the musculocutaneous nerve related to the fascia of the arm in the upper third of the arm?

It is located over the fascia and subcutaneously

In the upper third, the nerve is deeply situated under the fascia, penetrating through the coracobrachialis muscle.
It pierces the fascia and runs in a split

In the upper third, the nerve is deeply situated under the fascia, penetrating through the coracobrachialis muscle.
Absent in the upper third

In the upper third, the nerve is deeply situated under the fascia, penetrating through the coracobrachialis muscle.
It passes under the fascia in a deep muscular compartment

In the upper third, the nerve is deeply situated under the fascia, penetrating through the coracobrachialis muscle.
I find it difficult to answer

In the upper third, the nerve is deeply situated under the fascia, penetrating through the coracobrachialis muscle.

17. What does the musculocutaneous nerve innervate on the hand?

The skin of the thenar eminence

The area of innervation of the lateral antebrachial cutaneous nerve ends at the level of the radiocarpal joint; it does not innervate the hand itself.
It does not innervate hand structures

The area of innervation of the lateral antebrachial cutaneous nerve ends at the level of the radiocarpal joint; it does not innervate the hand itself.
The skin of the dorsum of the hand

The area of innervation of the lateral antebrachial cutaneous nerve ends at the level of the radiocarpal joint; it does not innervate the hand itself.
Lumbrical muscles

The area of innervation of the lateral antebrachial cutaneous nerve ends at the level of the radiocarpal joint; it does not innervate the hand itself.
I find it difficult to answer

The area of innervation of the lateral antebrachial cutaneous nerve ends at the level of the radiocarpal joint; it does not innervate the hand itself.

18. Which structure lies directly medial to the origin of the musculocutaneous nerve?

Axillary vein

The nerve branches off from the lateral cord, which lies laterally to the a. axillaris, respectively, the artery is medial to the nerve itself.
Long head of the triceps

The nerve branches off from the lateral cord, which lies laterally to the a. axillaris, respectively, the artery is medial to the nerve itself.
Axillary artery

The nerve branches off from the lateral cord, which lies laterally to the a. axillaris, respectively, the artery is medial to the nerve itself.
Coracoid process of the scapula

The nerve branches off from the lateral cord, which lies laterally to the a. axillaris, respectively, the artery is medial to the nerve itself.
I find it difficult to answer

The nerve branches off from the lateral cord, which lies laterally to the a. axillaris, respectively, the artery is medial to the nerve itself.

19. Indicate the precise localization of the musculocutaneous nerve according to Pirogov on a transverse section of the middle third of the arm:

In the fascial compartment between the anterior surface of the brachialis muscle and the posterior surface of the biceps

The nerve is located in a slit-like space between the m. biceps brachii anteriorly and m. brachialis posteriorly.
In the posterior fascial compartment of the arm

The nerve is located in a slit-like space between the m. biceps brachii anteriorly and m. brachialis posteriorly.
In the medial neurovascular bundle

The nerve is located in a slit-like space between the m. biceps brachii anteriorly and m. brachialis posteriorly.
In the lateral intermuscular septum

The nerve is located in a slit-like space between the m. biceps brachii anteriorly and m. brachialis posteriorly.
I find it difficult to answer

The nerve is located in a slit-like space between the m. biceps brachii anteriorly and m. brachialis posteriorly.

20. What fibers by function does n. cutaneus antebrachii lateralis contain?

Only motor

Being the terminal cutaneous branch of the musculocutaneous nerve, it is exclusively sensory.
Mixed (motor and sensory)

Being the terminal cutaneous branch of the musculocutaneous nerve, it is exclusively sensory.
Autonomic parasympathetic

Being the terminal cutaneous branch of the musculocutaneous nerve, it is exclusively sensory.
Only sensory

Being the terminal cutaneous branch of the musculocutaneous nerve, it is exclusively sensory.
I find it difficult to answer

Being the terminal cutaneous branch of the musculocutaneous nerve, it is exclusively sensory.