Ulnar nerve anatomy test

Test your knowledge of the ulnar nerve anatomy. The test covers its topography, branches in the arm, forearm and hand, as well as areas of innervation.

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1. From which bundle of the brachial plexus does the ulnar nerve originate?

Lateral cord

The ulnar nerve originates from the medial cord of the brachial plexus (C8-Th1 spinal nerve fibers).
Posterior cord

The ulnar nerve originates from the medial cord of the brachial plexus (C8-Th1 spinal nerve fibers).
Medial cord

The ulnar nerve originates from the medial cord of the brachial plexus (C8-Th1 spinal nerve fibers).
Superior cord

The ulnar nerve originates from the medial cord of the brachial plexus (C8-Th1 spinal nerve fibers).
I find it difficult to answer

The ulnar nerve originates from the medial cord of the brachial plexus (C8-Th1 spinal nerve fibers).

2. Which muscle does the ulnar nerve pierce in the arm when transitioning from the anterior to the posterior compartment?

Medial intermuscular septum

In the middle of the arm, the ulnar nerve along with the superior ulnar collateral artery pierce the medial intermuscular septum and transition to the posterior compartment.
Lateral intermuscular septum

In the middle of the arm, the ulnar nerve along with the superior ulnar collateral artery pierce the medial intermuscular septum and transition to the posterior compartment.
Coracobrachialis muscle

In the middle of the arm, the ulnar nerve along with the superior ulnar collateral artery pierce the medial intermuscular septum and transition to the posterior compartment.
The biceps brachii

In the middle of the arm, the ulnar nerve along with the superior ulnar collateral artery pierce the medial intermuscular septum and transition to the posterior compartment.
I find it difficult to answer

In the middle of the arm, the ulnar nerve along with the superior ulnar collateral artery pierce the medial intermuscular septum and transition to the posterior compartment.

3. In the groove behind which bony structure does the ulnar nerve pass at the elbow joint?

Lateral epicondyle of the humerus

The ulnar nerve is situated in the sulcus n. ulnaris posterior to the medial epicondyle of the humerus, where it lies superficially directly on the bone.
Medial epicondyle of the humerus

The ulnar nerve is situated in the sulcus n. ulnaris posterior to the medial epicondyle of the humerus, where it lies superficially directly on the bone.
The olecranon of the ulna

The ulnar nerve is situated in the sulcus n. ulnaris posterior to the medial epicondyle of the humerus, where it lies superficially directly on the bone.
Coronoid process of the ulna

The ulnar nerve is situated in the sulcus n. ulnaris posterior to the medial epicondyle of the humerus, where it lies superficially directly on the bone.
I find it difficult to answer

The ulnar nerve is situated in the sulcus n. ulnaris posterior to the medial epicondyle of the humerus, where it lies superficially directly on the bone.

4. Between the heads of which muscle does the ulnar nerve pass in the forearm?

Flexor carpi radialis

The ulnar nerve penetrates the forearm passing between the humeral and ulnar heads of the m. flexor carpi ulnaris.
Pronator teres

The ulnar nerve penetrates the forearm passing between the humeral and ulnar heads of the m. flexor carpi ulnaris.
Flexor digitorum superficialis

The ulnar nerve penetrates the forearm passing between the humeral and ulnar heads of the m. flexor carpi ulnaris.
Flexor carpi ulnaris

The ulnar nerve penetrates the forearm passing between the humeral and ulnar heads of the m. flexor carpi ulnaris.
I find it difficult to answer

The ulnar nerve penetrates the forearm passing between the humeral and ulnar heads of the m. flexor carpi ulnaris.

5. Which forearm muscles are innervated by the ulnar nerve?

Flexor carpi ulnaris and the medial half of the flexor digitorum profundus

In the forearm, the ulnar nerve gives off muscular branches only to the m. flexor carpi ulnaris and the medial part of the m. flexor digitorum profundus.
Brachioradialis and pronator teres

In the forearm, the ulnar nerve gives off muscular branches only to the m. flexor carpi ulnaris and the medial part of the m. flexor digitorum profundus.
Flexor carpi radialis and flexor pollicis longus

In the forearm, the ulnar nerve gives off muscular branches only to the m. flexor carpi ulnaris and the medial part of the m. flexor digitorum profundus.
Flexor digitorum superficialis and pronator quadratus

In the forearm, the ulnar nerve gives off muscular branches only to the m. flexor carpi ulnaris and the medial part of the m. flexor digitorum profundus.
I find it difficult to answer

In the forearm, the ulnar nerve gives off muscular branches only to the m. flexor carpi ulnaris and the medial part of the m. flexor digitorum profundus.

6. What is the synoptic relationship between the ulnar nerve and the ulnar artery in the lower third of the forearm?

The nerve is lateral to the artery

In the lower third of the forearm, the ulnar nerve accompanies the ulnar artery, lying strictly medial to it.
The nerve lies anterior to the artery

In the lower third of the forearm, the ulnar nerve accompanies the ulnar artery, lying strictly medial to it.
The nerve is posterior to the artery

In the lower third of the forearm, the ulnar nerve accompanies the ulnar artery, lying strictly medial to it.
The nerve is medial to the artery

In the lower third of the forearm, the ulnar nerve accompanies the ulnar artery, lying strictly medial to it.
I find it difficult to answer

In the lower third of the forearm, the ulnar nerve accompanies the ulnar artery, lying strictly medial to it.

7. Through which anatomical structure does the ulnar nerve pass to the hand?

Wrist canal (canalis carpi)

The ulnar nerve passes to the hand through the canalis carpi ulnaris (Guyon’s canal), lying anterior to the flexor retinaculum.
Anatomical snuffbox

The ulnar nerve passes to the hand through the canalis carpi ulnaris (Guyon’s canal), lying anterior to the flexor retinaculum.
Ulnar carpal tunnel (Guyon's canal)

The ulnar nerve passes to the hand through the canalis carpi ulnaris (Guyon’s canal), lying anterior to the flexor retinaculum.
Radial wrist canal

The ulnar nerve passes to the hand through the canalis carpi ulnaris (Guyon’s canal), lying anterior to the flexor retinaculum.
I find it difficult to answer

The ulnar nerve passes to the hand through the canalis carpi ulnaris (Guyon’s canal), lying anterior to the flexor retinaculum.

8. Which structures form the walls of the ulnar carpal canal (Guyon's canal)?

Scaphoid, trapezium and flexor retinaculum

Guyon's canal is bounded by the pisiform bone medially, the hook of the hamate laterally, the floor is formed by the retinaculum flexorum and the roof by the lig. palmaris carpi.
Pisiform bone, hook of hamate, palmar carpal ligament and flexor retinaculum

Guyon's canal is bounded by the pisiform bone medially, the hook of the hamate laterally, the floor is formed by the retinaculum flexorum and the roof by the lig. palmaris carpi.
Styloid process of the ulna and pronator quadratus

Guyon's canal is bounded by the pisiform bone medially, the hook of the hamate laterally, the floor is formed by the retinaculum flexorum and the roof by the lig. palmaris carpi.
Dorsal carpal ligament and triquetrum

Guyon's canal is bounded by the pisiform bone medially, the hook of the hamate laterally, the floor is formed by the retinaculum flexorum and the roof by the lig. palmaris carpi.
I find it difficult to answer

Guyon's canal is bounded by the pisiform bone medially, the hook of the hamate laterally, the floor is formed by the retinaculum flexorum and the roof by the lig. palmaris carpi.

9. Which fingers are innervated by the superficial branch of the ulnar nerve on the palmar surface of the hand?

V finger and ulnar half of the IV finger

The superficial branch of the ulnar nerve gives rise to the proper palmar digital nerves to the skin of the V finger and the ulnar side of the IV finger (1.5 fingers in total).
I, II, III and radial half of the IV finger

The superficial branch of the ulnar nerve gives rise to the proper palmar digital nerves to the skin of the V finger and the ulnar side of the IV finger (1.5 fingers in total).
Only the V finger

The superficial branch of the ulnar nerve gives rise to the proper palmar digital nerves to the skin of the V finger and the ulnar side of the IV finger (1.5 fingers in total).
IV and V fingers completely

The superficial branch of the ulnar nerve gives rise to the proper palmar digital nerves to the skin of the V finger and the ulnar side of the IV finger (1.5 fingers in total).
I find it difficult to answer

The superficial branch of the ulnar nerve gives rise to the proper palmar digital nerves to the skin of the V finger and the ulnar side of the IV finger (1.5 fingers in total).

10. Which of the thenar muscles (eminence) does the deep branch of the ulnar nerve innervate?

Abductor pollicis brevis

The deep branch of the ulnar nerve innervates the m. adductor pollicis and the deep head of the m. flexor pollicis brevis in the thenar eminence.
Opponens pollicis muscle

The deep branch of the ulnar nerve innervates the m. adductor pollicis and the deep head of the m. flexor pollicis brevis in the thenar eminence.
Superficial head of the flexor pollicis brevis

The deep branch of the ulnar nerve innervates the m. adductor pollicis and the deep head of the m. flexor pollicis brevis in the thenar eminence.
Adductor pollicis muscle

The deep branch of the ulnar nerve innervates the m. adductor pollicis and the deep head of the m. flexor pollicis brevis in the thenar eminence.
I find it difficult to answer

The deep branch of the ulnar nerve innervates the m. adductor pollicis and the deep head of the m. flexor pollicis brevis in the thenar eminence.

11. Which branch of the ulnar nerve provides sensory innervation to the skin of the medial dorsum of the hand and the dorsal surface of 2.5 fingers?

Superficial branch (r. superficialis)

Dorsal branch n. ulnaris departs in the lower third of the forearm, proceeds to the dorsum of the hand, and innervates the skin of the dorsum of the V, IV, and ulnar half of the III fingers.
Dorsal branch (r. dorsalis)

Dorsal branch n. ulnaris departs in the lower third of the forearm, proceeds to the dorsum of the hand, and innervates the skin of the dorsum of the V, IV, and ulnar half of the III fingers.
Deep branch (r. profundus)

Dorsal branch n. ulnaris departs in the lower third of the forearm, proceeds to the dorsum of the hand, and innervates the skin of the dorsum of the V, IV, and ulnar half of the III fingers.
Palmar branch (r. palmaris)

Dorsal branch n. ulnaris departs in the lower third of the forearm, proceeds to the dorsum of the hand, and innervates the skin of the dorsum of the V, IV, and ulnar half of the III fingers.
I find it difficult to answer

Dorsal branch n. ulnaris departs in the lower third of the forearm, proceeds to the dorsum of the hand, and innervates the skin of the dorsum of the V, IV, and ulnar half of the III fingers.

12. Which lumbrical muscles of the hand are innervated by the deep branch of the ulnar nerve?

Third and fourth

The deep branch of the ulnar nerve innervates the medial (third and fourth) lumbrical muscles, whereas the first two are innervated by the median nerve.
First and second

The deep branch of the ulnar nerve innervates the medial (third and fourth) lumbrical muscles, whereas the first two are innervated by the median nerve.
Second and third

The deep branch of the ulnar nerve innervates the medial (third and fourth) lumbrical muscles, whereas the first two are innervated by the median nerve.
All four lumbrical muscles

The deep branch of the ulnar nerve innervates the medial (third and fourth) lumbrical muscles, whereas the first two are innervated by the median nerve.
I find it difficult to answer

The deep branch of the ulnar nerve innervates the medial (third and fourth) lumbrical muscles, whereas the first two are innervated by the median nerve.

13. At what level does the dorsal branch of the ulnar nerve (ramus dorsalis) branch off?

At the level of the medial epicondyle of the humerus

The dorsal branch of the ulnar nerve branches off in the distal third of the forearm and passes under the tendon of the flexor carpi ulnaris to the dorsum of the hand.
In the upper third of the forearm

The dorsal branch of the ulnar nerve branches off in the distal third of the forearm and passes under the tendon of the flexor carpi ulnaris to the dorsum of the hand.
In the lower third of the forearm (5-10 cm above the wrist joint)

The dorsal branch of the ulnar nerve branches off in the distal third of the forearm and passes under the tendon of the flexor carpi ulnaris to the dorsum of the hand.
In the middle third of the forearm

The dorsal branch of the ulnar nerve branches off in the distal third of the forearm and passes under the tendon of the flexor carpi ulnaris to the dorsum of the hand.
I find it difficult to answer

The dorsal branch of the ulnar nerve branches off in the distal third of the forearm and passes under the tendon of the flexor carpi ulnaris to the dorsum of the hand.

14. Which cutaneous muscle does the superficial branch of the ulnar nerve innervate on the hand?

Palmaris longus muscle (m. palmaris longus)

The superficial branch of the ulnar nerve (r. superficialis) gives a motor branch exclusively to the palmaris brevis muscle (m. palmaris brevis).
Quadratus pronator (m. pronator quadratus)

The superficial branch of the ulnar nerve (r. superficialis) gives a motor branch exclusively to the palmaris brevis muscle (m. palmaris brevis).
Procerus muscle (m. procerus)

The superficial branch of the ulnar nerve (r. superficialis) gives a motor branch exclusively to the palmaris brevis muscle (m. palmaris brevis).
Palmaris brevis muscle (m. palmaris brevis)

The superficial branch of the ulnar nerve (r. superficialis) gives a motor branch exclusively to the palmaris brevis muscle (m. palmaris brevis).
I find it difficult to answer

The superficial branch of the ulnar nerve (r. superficialis) gives a motor branch exclusively to the palmaris brevis muscle (m. palmaris brevis).

15. Which interosseous muscles of the hand are innervated by the deep branch of the ulnar nerve?

Only palmar

The deep branch of the ulnar nerve (r. profundus) provides motor innervation to all palmar and dorsal interosseous muscles of the hand without exception.
Only dorsal

The deep branch of the ulnar nerve (r. profundus) provides motor innervation to all palmar and dorsal interosseous muscles of the hand without exception.
All palmar and dorsal interosseous muscles

The deep branch of the ulnar nerve (r. profundus) provides motor innervation to all palmar and dorsal interosseous muscles of the hand without exception.
Interosseous muscles are not innervated by the ulnar nerve

The deep branch of the ulnar nerve (r. profundus) provides motor innervation to all palmar and dorsal interosseous muscles of the hand without exception.
I find it difficult to answer

The deep branch of the ulnar nerve (r. profundus) provides motor innervation to all palmar and dorsal interosseous muscles of the hand without exception.

16. Along with which artery does the ulnar nerve pass in the upper half of the arm?

Brachial artery

In the upper third of the arm, the ulnar nerve is located in the medial bicipital groove (sulcus bicipitalis medialis) along with the brachial artery and veins.
Radial artery

In the upper third of the arm, the ulnar nerve is located in the medial bicipital groove (sulcus bicipitalis medialis) along with the brachial artery and veins.
Deep brachial artery

In the upper third of the arm, the ulnar nerve is located in the medial bicipital groove (sulcus bicipitalis medialis) along with the brachial artery and veins.
Axillary artery

In the upper third of the arm, the ulnar nerve is located in the medial bicipital groove (sulcus bicipitalis medialis) along with the brachial artery and veins.
I find it difficult to answer

In the upper third of the arm, the ulnar nerve is located in the medial bicipital groove (sulcus bicipitalis medialis) along with the brachial artery and veins.

17. Which branch of the ulnar nerve does not pass through Guyon's canal (canalis carpi ulnaris)?

Superficial branch

The palmar branch (r. palmaris) of the ulnar nerve arises proximal to Guyon's canal and courses superficially to the flexor retinaculum to innervate the skin of the hypothenar eminence.
Palmar branch (r. palmaris)

The palmar branch (r. palmaris) of the ulnar nerve arises proximal to Guyon's canal and courses superficially to the flexor retinaculum to innervate the skin of the hypothenar eminence.
Deep branch

The palmar branch (r. palmaris) of the ulnar nerve arises proximal to Guyon's canal and courses superficially to the flexor retinaculum to innervate the skin of the hypothenar eminence.
Proper palmar digital nerves

The palmar branch (r. palmaris) of the ulnar nerve arises proximal to Guyon's canal and courses superficially to the flexor retinaculum to innervate the skin of the hypothenar eminence.
I find it difficult to answer

The palmar branch (r. palmaris) of the ulnar nerve arises proximal to Guyon's canal and courses superficially to the flexor retinaculum to innervate the skin of the hypothenar eminence.

18. How is the ulnar nerve positioned relative to the medial intermuscular septum of the arm in its lower third?

Passes anterior to it

Piercing the medial intermuscular septum at the mid-arm, the nerve descends behind it, located in the posterior fascial compartment on the medial head of the triceps.
Located within the septum itself

Piercing the medial intermuscular septum at the mid-arm, the nerve descends behind it, located in the posterior fascial compartment on the medial head of the triceps.
Does not contact the intermuscular septum

Piercing the medial intermuscular septum at the mid-arm, the nerve descends behind it, located in the posterior fascial compartment on the medial head of the triceps.
Passes behind it in the posterior fascial compartment

Piercing the medial intermuscular septum at the mid-arm, the nerve descends behind it, located in the posterior fascial compartment on the medial head of the triceps.
I find it difficult to answer

Piercing the medial intermuscular septum at the mid-arm, the nerve descends behind it, located in the posterior fascial compartment on the medial head of the triceps.

19. With which nerve does the ulnar nerve form its most well-known anastomosis in the forearm (Martin-Gruber anastomosis)?

With the median nerve

The Martin-Gruber anastomosis refers to a connecting branch between the median and ulnar nerves in the forearm, occurring as a variant of normal anatomy.
With the radial nerve

The Martin-Gruber anastomosis refers to a connecting branch between the median and ulnar nerves in the forearm, occurring as a variant of normal anatomy.
With the musculocutaneous nerve

The Martin-Gruber anastomosis refers to a connecting branch between the median and ulnar nerves in the forearm, occurring as a variant of normal anatomy.
With the medial antebrachial cutaneous nerve

The Martin-Gruber anastomosis refers to a connecting branch between the median and ulnar nerves in the forearm, occurring as a variant of normal anatomy.
I find it difficult to answer

The Martin-Gruber anastomosis refers to a connecting branch between the median and ulnar nerves in the forearm, occurring as a variant of normal anatomy.

20. Which hypothenar muscle is NOT innervated by the ulnar nerve?

Abductor digiti minimi muscle (m. abductor digiti minimi)

All muscles of the hypothenar eminence, without exception, are innervated by branches of the deep branch of the ulnar nerve.
Flexor digiti minimi brevis muscle (m. flexor digiti minimi brevis)

All muscles of the hypothenar eminence, without exception, are innervated by branches of the deep branch of the ulnar nerve.
All hypothenar muscles are innervated by the ulnar nerve

All muscles of the hypothenar eminence, without exception, are innervated by branches of the deep branch of the ulnar nerve.
Opponens digiti minimi muscle (m. opponens digiti minimi)

All muscles of the hypothenar eminence, without exception, are innervated by branches of the deep branch of the ulnar nerve.
I find it difficult to answer

All muscles of the hypothenar eminence, without exception, are innervated by branches of the deep branch of the ulnar nerve.