The adductor pollicis is an intrinsic muscle of the hand. It is a triangular shape with two heads. The radial artery passes anteriorly through the space between the two heads to form the deep palmar arch.
- One head originates from the third metacarpal.
- The other head originates from the capitate and adjacent areas of second and third metacarpal.
- Both heads attach onto the base of the proximal phalanx of the thumb.
- Actions: Adduction of the thumb.
- Innervation: Ulnar nerve.
- Blood Supply: Deep palmar arch.