Deep Muscles of Posterior Compartment of Forearm Flashcards
Main action of supinator?
Flexes forearm
Name the deep muscles of the posterior compartment of the forearm?
- Supinator
- Abductor pollicis longus
- Extensor pollicis brevis
- Extensor pollicis longus
- Extensor indicis
Main action of abductor pollicis longus?
- Adducts thumb
- Extends thumb at carpometacarpal joint
Main action of extensor pollicis brevis?
Extends proximal phalanx at carpometacarpal joint
Main action of extensor pollicis longus?
Extends distal phalanx of thumb at metacarpophalangeal & interphalangeal joints
Main action of extensor indicis?
- Extends 2nd digit
- Helps extend hand
Innervation of deep muscles of the post. compartment of the forearm?
Radial nerve
Proximal attachment of supinator?
- Lat. epicondyle of humerus
- Radial collateral ligaments
- Radial annular ligament
- Supinator fossa
- Crest of ulna
Distal attachment of supinator?
Lat. surface of distal end of radius
Proximal attachment of abductor pollicis longus?
- Post. surfaces of ulna
- Post. surfaces of radius
- Interosseous membrane
Distal attachment of abductor pollicis longus?
Base of 1st metacarpal bone
Proximal attachment of extensor pollicis brevis?
- Post. surface of radius
- Interosseous membrane
Distal attachment of extensor pollicis brevis?
Base of proximal phalanx of thumb
Proximal attachment of extensor pollicis longus?
- Post. surface of middle 3rd of ulna
- Interosseous membrane
Distal attachment of extensor pollicis longus?
Base of distal phalanx of thumb
