Deep Branch Of Ulnar

The deep branch of the ulnar nerve is a terminal branch of the ulnar nerve. It supplies the intrinsic muscles of the hand, including the hypothenar muscles, the lumbricals, and the interossei. It also supplies the adductor pollicis muscle. Origin: The deep branch of the ulnar nerve arises from the ulnar nerve just distal to the pisiform bone. Course: The deep branch of the ulnar nerve passes between the abductor digiti minimi and the flexor digiti minimi brevis muscles. It then perforates the opponens digiti minimi and follows the course of the deep palmar arch beneath the flexor tendons. As the deep ulnar nerve passes across the palm, it lies in a fibrous tunnel formed between the hook of the hamate and the pisiform (Guyon's canal).

Ulnar

The brachial plexus is formed by the ventral rami of c5-c8-t1 spinal nerves, and lower and upper halves of c4 and t2 spinal nerves. the plexus extends toward the armpit. the ventral rami of c5 and c6 form upper trunk, the ventral ramus of c7 forms the middle trunk, and the ventral rami of c8 and t1 join to form the lower trunk of the brachial plexus. under the clavicle, the trunks reorganize to form cords (fasciculi) around the axillary artery (arteria axillaris). the lateral cord (fasciculus lateralis) is formed by the upper and middle trunk, all three trunks join to form the posterior cord (fasciculus posterior), the lower trunk continues to the medial trunk (fasciculus medialis). the nerves (containing motor and sensory fibers) to the shoulder and to the upper limb emerge from the brachial plexus.