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Anatomy of Adductor Pollicis


Courtesy: Prof Nabile Ebraheim, University of Toledo, Ohio, USA

Adductor pollicis muscle

It is a small muscle of the hand and that is a very important muscle.

Anatomy of the muscle

Origin
2 heads :
1. Transverse head- arises from the radial surface of the body of 3rd metacarpal
2. Oblique head- arises from the second and third metacarpals. Also arises from capitate bone and adjacent carpals.

Insertion:

  • 2 heads converge into a tendon and inserts along with the fibers of flexor pollicis brevis into the medial side(ulnar aspect at the base of proximal phalanx)of the thumb.
  • There is a sesamoid bone passing in the tendon.
  • The tendon inserts into the ulnar sesamoid bone of the thumb.
  • It also inserts into the dorsal apparatus.

Function

  • The predominant action of the adductor pollicis is adduction of the thumb metacarpal.
  • It draws the first metacarpal laterally to oppose the thumb towards the center of the palm and rotate it medially.
  • The adductor pollicis also works on the interphalangeal joint(ip)causing extension of that joint.
  • It also works on the metacarpophalangeal joint (mcp) causing flexion of that joint.
  • Action of the adductor pollicis muscle is complicated:
    1. First metacarpal adduction
    2. MCP flexion
    3. IP extension

INNERVATION

  • Deep branch of ulnar nerve(C8,T1)

 

adductor pollicis anatomy

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