Which nerve innervates the subclavius muscle?

Which nerve innervates the subclavius muscle?

• A. Nerve to subclavius
• B. Axillary nerve
• C. Dorsal scapular nerve
• D. Spinal accessory nerve

Answer: (A)

The subclavius is innervated by a dedicated motor branch from the brachial plexus called the nerve to subclavius, which arises from C5–C6. This branch specifically targets the subclavius muscle as it courses toward under the clavicle, providing its motor supply. The other nerves listed supply different muscles: the axillary nerve to deltoid and teres minor, the dorsal scapular nerve to rhomboids and levator scapulae, and the spinal accessory nerve to sternocleidomastoid and trapezius. Therefore, the nerve to subclavius is the correct innervation.

The subclavius is innervated by a dedicated motor branch from the brachial plexus called the nerve to subclavius, which arises from C5–C6. This branch specifically targets the subclavius muscle as it courses toward under the clavicle, providing its motor supply. The other nerves listed supply different muscles: the axillary nerve to deltoid and teres minor, the dorsal scapular nerve to rhomboids and levator scapulae, and the spinal accessory nerve to sternocleidomastoid and trapezius. Therefore, the nerve to subclavius is the correct innervation.