The palmar branch of the ulnar nerve arises about five cm above the wrist from where the ulnar nerve

Ulnar nerve

In human anatomy, the ulnar nerve is a nerve which runs near the ulna bone. The ulnar collateral ligament of elbow joint is in relation with the ulnar nerve. The nerve is the largest unprotected nerve in the human body , so injury is common...

 splits into palmar and dorsal branches.

The palmar branch represents the continuation of the ulnar nerve as it crosses the flexor retinaculum of the hand

Flexor retinaculum of the hand

The flexor retinaculum is a strong, fibrous band that arches over the carpus, converting the deep groove on the front of the carpal bones into a tunnel, the carpal tunnel, through which the Flexor tendons of the digits and the median nerve pass.It is attached, medially, to the pisiform and the...

 on the lateral side of the pisiform bone, medial to and a little behind the ulnar artery

Ulnar artery

The ulnar artery is the main blood vessel, with oxygenated blood, of the medial aspect of the forearm. It arises from the brachial artery and terminates in the superficial palmar arch, which joins with the superficial branch of the radial artery...

.

Some sources state that it ends by dividing into a superficial and a deep branch. (Other sources state that the superficial branch of ulnar nerve

Superficial branch of ulnar nerve

The superficial branch of the ulnar nerve is a terminal branch of the ulnar nerve. It supplies the palmaris brevis and the skin on the ulnar side of the hand, and divides into a proper palmar digital nerve and a common palmar digital nerve....

 and deep branch of ulnar nerve

Deep branch of ulnar nerve

The deep branch of the ulnar nerve is a terminal, primarily motor branch of the ulnar nerve.It is accompanied by the deep palmar branch of ulnar artery.-Path:It passes between the abductor digiti minimi and the flexor digiti minimi brevis....

are the terminal branches of the ulnar nerve itself.)