Outcropping muscles of deep layer Flashcards
What is the distal attachment of abductor pollicis longus?
base of first metacarpal
What is the proximal attachment of abductor pollicis longus?
posterior surface of proximal halves of ulna, radius, and interosseous membrane
What innervates abductor pollicis longus?
posterior interosseous nerve (C7, C8) [continuation of deep branch of radial nerve]
What are the main actions of abductor pollicis longus?
abducts thumb and extends it at carpometacarpal joint
What is the proximal attachment of extensor pollicis longus?
posterior surface of middle third of ulna and interosseous membrane
What is the distal attachment of extensor pollicis longus?
dorsal aspect of base of distal phalanx of thumb
What innervates extensor pollicis longus?
posterior interosseous nerve (C7, C8) [continuation of deep branch of radial nerve]
What are the main actions of extensor pollicis longus?
extends distal phalanx of thumb at interphalangeal joint; extends metacarpophalangeal and carpometacarpal joints
What is the proximal attachment of extensor pollicis brevis?
posterior surface of distal third of radius and interosseous membrane
What is the distal attachment of extensor pollicis brevis?
dorsal aspect of base of proximal phalanx of thumb
What innervates extensor pollicis brevis?
posterior interosseous nerve (C7, C8) [continuation of deep branch of radial nerve]
What are the main actions of extensor pollicis brevis
extends proximal phalanx of thumb at metacarpophalangeal joint; extends carpometacarpal joint
What is the proximal attachment of extensor indicis?
posterior surface of distal third of ulna and interosseous membrane
What is the distal attachment of extensor indicis?
extensor expansion of 2nd finger
What innervates extensor indicis?
posterior interosseous nerve (C7, C8) [continuation of deep branch of radial nerve]
