The muscles of the thumb are nine skeletal muscles located in the hand and forearm. The muscles allow for flexion, extension, adduction, abduction and opposition of the thumb. The muscles acting on the thumb can be divided into two groups: The extrinsic hand muscles, with their muscle bellies located in the forearm, and the intrinsic hand Artery: Ulnar and radial arteries. The palmar interosseous muscles adduct the fingers towards the middle finger. This is in contrast to the dorsal interossei, which abduct the fingers away from the middle finger. In addition (like dorsal interossei) they flex the finger at the metacarpo-phalangeal joint and extend the finger at the interphalangeal joint and thus assist the Insertion: Bases of proximal phalanges, .
Identify the nerve injury. STUDY. PLAY. inability to oppose thumb; weakened thumb flexion; may occur from superficial laceration at first MP joint; wasting of thenar eminence; lumbrical paralysis; loss of lateral sensation over lateral palm and lateral 3.5 digits inability to adduct or abduct fingers and to inability to adduct thumb. Jul 16, 2019 · One of these muscles, the opponens pollicis, moves the thumb across the hand to oppose the other fingers, allowing us to pinch a small object between the thumb and finger to pick it up. The abductor pollicis brevis and adductor pollicis work as antagonists to abduct and adduct .