Study of the first palmar interosseous muscle

ABSTRACT

This work aimed to study the frequency of occurrence of the pollical palmar interosseous muscle in humans and its anatomical features. It was carried out on 46 hands of human cadavers. The study revealed that the muscle was present in 19 hands on the right side and in 18 left hands. The muscle originated from the first metacarpal bone in 16 cases and from the first metacarpal and the trapezium in 3 cases on the right side. On the left side, the muscle originated from the first metacarpal in 16 cases and from the first metacarpal and the trapezium in 2 cases. In all cases, the muscle was inserted, together with the adductor pollicis muscle, into the medial side of the wing tendon of the extensor pollicis longus muscle. The first palmar interosseous muscle was separated from the adductor pollicis muscle by the radial artery and from the body of the first metacarpal by a branch of the radial artery, the princeps pollicis. Several functions of the muscle were proposed