Which nerve innervates the deltoid?

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Multiple Choice

Which nerve innervates the deltoid?

Explanation:
The nerve that innervates the deltoid is the axillary nerve. It arises from the posterior cord of the brachial plexus (C5–C6) and travels through the quadrangular space to reach the deltoid muscle, also supplying the teres minor. This explains why weakness of shoulder abduction and numbness over the lateral shoulder can occur with axillary nerve issues. The other nerves listed supply different regions: the median nerve mainly flexes forearm muscles and some hand muscles, the radial nerve supplies the posterior arm/forearm extensors, and the musculocutaneous nerve supplies the anterior arm flexors.

The nerve that innervates the deltoid is the axillary nerve. It arises from the posterior cord of the brachial plexus (C5–C6) and travels through the quadrangular space to reach the deltoid muscle, also supplying the teres minor. This explains why weakness of shoulder abduction and numbness over the lateral shoulder can occur with axillary nerve issues. The other nerves listed supply different regions: the median nerve mainly flexes forearm muscles and some hand muscles, the radial nerve supplies the posterior arm/forearm extensors, and the musculocutaneous nerve supplies the anterior arm flexors.

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