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Question 1
Which nerve innervates Latissimus Dorsi?
Correct Answer:
Upper subscapular nerve
Explanation:
Latissimus dorsi is motor-innervated by the thoracodorsal nerve, a branch of the posterior cord of the brachial plexus. This nerve carries fibers from C6 through C8 (with occasional contribution from nearby levels) and travels to reach the latissimus dorsi to provide its motor input. The muscle’s actions are to extend, adduct, and medially rotate the arm, which you’ll feel when you pull yourself up or perform strokes like swimming; the thoracodorsal nerve is essential for those powerful pulling movements. The other nerves listed don’t supply this muscle. Upper and lower subscapular nerves serve the subscapularis and, in the case of the lower subscapular, teres major. The axillary nerve supplies deltoid and teres minor. So the thoracodorsal nerve is the correct innervation for latissimus dorsi.
Question 2
Which of the following is NOT innervated by the median nerve?
Correct Answer:
Flexor Carpi Ulnaris
Explanation:
The main idea is how the forearm flexors are innervated by the nerves. Most flexors in the anterior forearm get input from the median nerve, but there are two notable exceptions: the flexor carpi ulnaris and the medial (ulnar) half of the flexor digitorum profundus are supplied by the ulnar nerve. Among the options, the muscle that is not supplied by the median nerve is the flexor carpi ulnaris. It flexes and adducts the wrist, and its innervation comes from the ulnar nerve. The other muscles listed—pronator teres, palmaris longus, and the lateral half of flexor digitorum profundus—are innervated by the median nerve (with FDP’s lateral half receiving median nerve input and the medial half by the ulnar nerve).
Question 3
Which nerve has root contributions of C8-T1?
Correct Answer:
Ulnar nerve
Explanation:
Root levels feeding a peripheral nerve reveal how high or low in the plexus the fibers come from. The ulnar nerve is formed from the medial cord, which carries fibers from the lower trunk, specifically C8 and T1. That makes its primary root contributions C8-T1. In contrast, the radial nerve comes from the posterior cord with roots spanning C5 through T1; the median nerve comes from both the lateral and medial cords, also overall C5 through T1; and the musculocutaneous nerve comes from the lateral cord with roots C5-C7. So, while other nerves may receive some C8-T1 fibers, their overall root sets extend beyond C8-T1, whereas the ulnar nerve is characteristically C8-T1.
Question 4
Which skin area is innervated by the sensory fibers of the axillary nerve?
Correct Answer:
The lateral arm skin over the deltoid
Explanation:
This question tests the sensory territory of the axillary nerve. The axillary nerve provides sensation to the skin over the lateral shoulder via the superior lateral cutaneous nerve of the arm, which covers the deltoid region (the area often called the regimental badge area). That’s why the skin over the deltoid is the correct choice—the other regions receive sensation from different nerves: the dorsolateral forearm from the lateral antebrachial cutaneous nerve (a branch of the musculocutaneous nerve), the web space between the thumb and index dorsally from the superficial branch of the radial nerve, and the palm of the hand from branches of the median and ulnar nerves.
Question 5
What spinal nerves contribute to the upper subscapular nerve?
Correct Answer:
C5, C6
Explanation:
The upper subscapular nerve comes from the posterior cord of the brachial plexus and carries fibers from the C5 and C6 roots. These roots combine to innervate the upper part of the subscapularis muscle, so the contributing spinal nerves are C5 and C6. While some anatomical variation can include a trace of C7, the standard exam answer is C5-C6. Omitting a root (C5 alone) or bringing in roots associated with other nerves (C7-C8 for the thoracodorsal nerve, or including C4 which isn’t typical here) would not fit the usual pattern.
Question 1
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About this Exam

Prepare with the Brachial Plexus Practice Test practice quiz. This question bank includes 10 questions covering nerve, innervated, axillary, muscles, and brachial. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Brachial Plexus Practice Test

This practice set contains 10 questions from the matching question bank and focuses on nerve, innervated, axillary, muscles, and brachial. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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