GROSS ANATOMY

Detailed explanation-1: -The middle subscapular nerve (C6-C8), also known as the thoracodorsal nerve, innervates the latissimus dorsi muscle and travels with the thoracodorsal artery. The 5 terminal branches of the brachial plexus are the musculocutaneous, median, ulnar, axillary, and radial nerves.

Detailed explanation-2: -This nerve complex is composed of four cervical nerve roots (C5-C8) and the first thoracic nerve root (T1). These roots combine to form three trunks. C5-C6 form the upper trunk, C7 continues as the middle trunk and C8-T1 form the lower trunk.

Detailed explanation-3: -Typically, the brachial plexus is composed of 5 roots, 3 trunks, 6 divisions, 3 cords, and terminal branches, as seen in the image below. Brachial plexus with terminal branches labeled. MC is musculocutaneous (nerve), AXI is axillary, RAD is radial, MED is median, and ULN is ulnar.

Detailed explanation-4: -The fifth and final level of the brachial plexus are the five nerves that feed the shoulder and arm called “branches.” These five branches are named the musculocutaneous, axillary, radial, median, and ulnar nerves.