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Finger & Thumb

Selected Muscles of Finger & Thumb

muscledescription
flexor digitorum profundus Origin: ulna. Insertion: phalanges (#2-5). Actions: FLEXES wrist, metacarpophalangeal, & interphalangeal joints
Flexor digitorum superficialis Origin: humerus, ulna, radius. Insertion: phalanges (# 2-5). Actions: FLEXES wrist, metacarpophalangeal, & interphalangeal joints
Extensor digitorum Origin: humerus. Insertion: Phalanges (# 2-5). Actions: EXTENDS wrist, metacarpophalangeal, & interphalangeal joints.
Extensor indicis Origin: ulna. Insertion: tendon of extensor digitorum (phalange # 2). Actions: EXTENDS wrist, metacarpophalangeal, & interphalangeal joints.
Extensor digiti minimi Origin: humerus. Insertion: tendon of extensor digitorum (phalange # 5). Actions: EXTENDS wrist & metacarpophalangeal joints.
Abductor pollicis brevis Origin: carpals (scaphoid & trapezium). Insertion: thumb (proximal phalanx). Actions: ABDUCTS carpometacarpal joint.
Flexor pollicis brevis Origin: carpals (trapezium, capitate, & trapezoid). Insertion: thumb (proximal phalanx) . Actions: FLEXES carpometacarpal & metacarpophalangeal joints.
Adductor pollicis Origin: carpal (capitate) & metacarpals (# 2 & 3). Insertion: thumb (proximal phalanx). Actions: ADDUCTS carpometacarpal & metacarpophalangeal joints.
Extensor pollicis longus Origin: ulna. Insertion: thumb (distal phalanx). Actions: EXTENDS carpometacarpal & interphalangeal joints. ABDUCTS wrist.
Extensor pollicis brevis Origin: radius. Insertion: thumb (distal phalanx). Actions: EXTENDS wrist, carpometacarpal, & metacarpophalangeal joints.
Abductor pollicis longus Origin: radius, ulna. Insertion: metacarpal (# 1). Actions: ABDUCTS wrist & carpometacarpal joints. EXTENDS carpometacarpal joint.
Created by: stoneelf
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