Nerves of The Arm

MUSCULOCUTANEOUS NERVE:

Origin: C5 C6 of the lateral cord of the brachial plexus

Pierces the coracobrachialis muscle

Supplies all the muscles in the anterior compartment of the arm.

MEDIAN AND ULNAR NERVE:

Median:

Origin: from the lateral cord of the brachial plexus

Course: Upper arm - it travels laterally to brachial artery but then converses anteriorly to lie medially to the artery about mid arm level.

Ulnar:

Origin - medial cord of the brachial plexus

Course: Upper arm - it travels medially to the brachial artery and then it leaves the artery and pierces the intermuscular septum to enter the posterior compartment. Here it lies between the septum and the medial head of triceps.

Radial Nerve:

Origin: c7 c8 roots of the posterior cord of the brachial plexus.

Supplies: All the posterior compartment muscles of the arm

Entry into cubital fossa is beneath the brachioradialis muscle

Category: Anatomy Notes