Axillary Nerve A. provides motor innervation to the biceps brachiiB. innervates two forearm muscles plus most of the intrinsic hand musclesC. innervates all but one of the flexor muscles of the forearm and most of the hand muscles near the thumbD. innervates the deltoid and teres minor musclesE. innervates the triceps brachii
D. innervates the deltoid and teres minor muscles
D. Innervates the deltoid and teres minor muscles.
The axillary nerve arises from the posterior cord of the brachial plexus and innervates the deltoid and teres minor muscles of the shoulder. It is responsible for the movement of the arm away from the body (abduction) and rotation of the arm outward (external rotation). It does not innervate any muscles in the forearm or hand.
A is incorrect because motor innervation to the biceps brachii is provided by the musculocutaneous nerve.
B is incorrect because the two forearm muscles innervated by the axillary nerve are the brachioradialis and extensor carpi radialis. The intrinsic hand muscles are not innervated by the axillary nerve.
C is incorrect because the flexor muscles of the forearm are innervated by the median and ulnar nerves. The hand muscles near the thumb are innervated by the median and radial nerves.
E is incorrect because the triceps brachii is innervated by the radial nerve.
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