Adductor Pollicis
The structure indicated is the adductor pollicis muscle of the hand. The adductor pollicis muscle belong to the intrinsic group of muscles which act on the hand. The intrinsic muscles include the following muscles/groups:- Thenar group (act on thumb)
- Hypothenar group (act on little finger)
- Adductor pollicis
- Lumbricals
- Interossesus muscles (palmar and dorsal interossei)
- Palmaris brevis
- Transverse head
- Oblique head
Origin: Oblique head – capitate and bases of metacarpals 2 and 3. Transverse head – Metacarpal 3
Insertion: Base of proximal phalanx and extensor expansion of thumb
Action: Adduction of thumb
Innervation: Deep branch of ulnar nerve
Learn more about the anatomy of the hand muscles in this tutorial.