Anatomical Variation of Palmaris Longus: Tendinous Origin and Fleshy Insertion

Abstract

A tendinous origin and fleshy insertion of palmaris longus muscle was observed in the left forearm during routine dissection which was performed on adult male cadaver in the department of Anatomy, Dr. Rajendra Prasad Government Medical College. It was having long tendinous origin from the medial epicondyle of the humerus and the surrounding deep fascia. It was fusiform at the lower middle of the forearm. The fleshy muscular insertion was noted to the flexor retinaculum and few muscular fibers interdigitate with flexor carpi ulnaris muscle and palmar aponeurosis. The length of tendon was 19 inches and fleshy muscular length was 11inches. The median nerve and ulnar nerve was covered by this fleshy insertion. This palmaris longus variation is helpful for the surgeon and the radiologist, orthopaedic, plastic surgeon during any diagnosis of the forearm because this fleshy part of muscle can compress the median nerve and ulnar nerve or it can be mistaken as a tumor or ganglion during radiological or clinical examination.

Palmaris Inversus Muscle: A Case Report With Clinical and Surgical Discussions

“…flexor carpi radialis and flexor carpi ulnaris muscles and superficial to the median nerve [1][2][3][4][5]. It is supplied by branches of the ulnar and brachial arteries, and branches of the median nerve supply its innervations [2,6].…”

“…Those include carpal tunnel syndrome and Guyon syndrome. Moreover, its variations can be difficult to identify and be misleading in radiological investigations [3,4,9].…”