What is Aponens Pollicis?

Aponens pollicis is a muscle of the thumb that contributes to the movement of the opposition or to the act of converting the thumb over the palm of the hand as when gripping an object or touching the thumb to the other fingers. Unlike many muscles and tendons in the hand that runs longitudinally, this muscle passes through the lower part of the hand obliquely. Triangular in the shape, APONENS Pollicis is one of the Tekar muscles, a group of three muscles that form a massive area between the thumb and wrist. Trapezium is one of the eight small karpus bones, bones in hand grouped just behind the wrist. Specifically, the nearest thumb base is located and connects the metacarpal bones of the thumb at its lower end. Flexor Retinaculum is a large, wide ligament that obscures the palm side of the wrist perpendicularly, with Tekar's muscles resulting from his thumb side and another group of muscles resulting from the side of the side. This liga works to hold many tendons and vascular vascular in place as they pass the wrist from the forearm.

From the lateral aspect of the flexor retinacula and the neighboring folk bones, the aponens pollicis extends deep to the muscle Abductor Pollicis brevis. Abductor Pollicis Brevis is the most and found closest to the wrist along the nearby boundary of the underside. Aponens Pollicis runs immediately below it towards its side. It then intersects distally or far away from the body and laterally or towards the thumb side of the hand.

This muscle is then inserted along the outer boundary of the first metacarpal, the bone at the CHumb base, which stretches between the carpus of the wrist and the proximal phalange thumb, which is closer to two inch bones. When it retreats, the shortening of the opponents of Pollicis pulls the entire thumb down and inwards towards the palm of the hand by bending the joint between metacarpal and carpus. This causes the palm of the palm as a cup, one of several muscle actions that make the human thumb against it.