In the case of a five fingered-hand it has a finger-like appearance, with the position in the plane of the four fingers, thenar muscle deficiency, and additional length.
For opposition and therefore precision grips, several factors are necessary: adequate thumb position, adequate length of the thumb, stable joints and adequate thenar muscle or thumb strength.
Running forward, it passes through, occasionally over, the thenar muscles, which it supplies, and sometimes anastomoses with the terminal portion of the ulnar artery, completing the superficial palmar arch.
It is a fleshy, flat, triangular, and fan-shaped muscle deep in the thenar compartment beneath the long flexor tendons and the lumbrical muscles at the center of the palm.
It is one of three thenar muscles.
It can occur with an injury of the median nerve either at the elbow or the wrist, impairing the thenar muscles and opponens pollicis muscle.
It is a thenar muscle, and therefore contributes to the bulk of the palm's thenar eminence.
The palm consist of two elongated central pads, a hypothenar pad and a thenar pad.
