Finger extensors Flashcards
name the finger extensors
Extensor Digitorum, Extensor Digiti Minimi, Interossei, Lumbricals
Extensor Digitorum origin
lat. epicondyle of humerous via common extensor tendon
Extensor Digitorum insertion
via dorsal digital expansion to base of posterior surface distal & middle phalanges of fingers
Extensor Digitorum nerve supply
post. interosseous branch of radial nerve c7, 8
Extensor Digitorum action
extends distal & proximal interphalangeal, metacarpophalangeal & wrist joints
Extensor Digitorum function
blocking
Extensor Digiti Minimi origin
lat. epicondyle of humerous, via common extensor tendon
Extensor Digiti Minimi instertion
joins doral digital expansion of little finger
Extensor Digiti Minimi nerve supply
post. interosseous branch of radial nerve C7, C8
Extensor Digiti Minimi action
little finger extension
Extensor Digiti Minimi function
blocking
Palmar Interossei origin
shaft of a metacarpal
dorsal Interossei origin
sides of adjacent metacarpals
Palmar Interossei insertion
dorsal digit expansion & base of proximal phalanx
dorsal Interossei insertion
dorsal digital expansion & proximal pahalanx
Interossei nerve supply
ulnar nerve T1
Palmar Interossei action
adducts all digits except middle finger
Dorsal Interossei action
abduct index, middle & ring fingers
Interossei function
blocking
Lumbricals origin
lat. side of flexor digitorum profundus tendons
Lumbricals insertion
let. edge dorsal digital expansion of same finger
Lumbricals nerve supply
Lateral 2: median nerve T1
medial 2: ulnar nerve T1
Lumbricals action
flex mcp joint
Lumbricals action
flex mcp joint
Lumbricals function
gripping
