A peculiar variation of the musculature of the front of the forearm.
On the front of the right forearm of an adult male individual a hitherto undescribed supernumerary muscle was observed. This fusiform muscle originated from the lateral aspect of the coronoid process of the ulna and the lateral margin of the radius, distal to the attachment of the supinator muscle, and inserted - through the intermediary of an aponeurotic structure enveloping the synovial sheaths of the flexor digitorum superficialis and profundus and flexor pollicis longus muscles as well as of the extensor pollicis brevis and abductor pollicis longus muscles - to the pisiform bone, the pisohamate ligament and the tubercles of the trapezium and the scaphoid bone. It is argued that the muscle belongs to the group of the deep flexor muscles.
D000328:Adult; D005542:Forearm / Q000033:anatomy & histology*; D006801:Humans; D008297:Male; D009132:Muscles / Q000033:anatomy & histology* / Q000098:blood supply / Q000294:innervation; D013710:Tendons / Q000033:anatomy & histology; D014955:Wrist Joint / Q000033:anatomy & histology