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Med School Muscles
Origins, Insertions, Innervations and actions
Question | Answer |
---|---|
Brachioradialis Proximal attachment (origin)? | Proximal 2/3 or supraepicondylar ridge of humerus |
Brachioradialis distal attachments? | distal radius (proximal to styloid process) |
Brachioradialis innervation? | Radial nerve (C5,C6,C7) |
Brachioradialis main actions? | Flexes forearm when protonated |
Extensor carpi radialis longus origin? | lateral supraepicondylar ridge of humerus |
Extensor carpi radialis longus insertion? | dorsal aspect of base of 2nd metacarpel |
Extensor carpi radialis longus innervation? | Radial nerve (c6,c7) |
Extensor carpi radialis longus action? | Extends and ABducts hand at wrist |
E. Carpi radialis brevis origin? | lateral epicondyle of humerus (common extensor origin) |
E. Carpi radialis brevis insertion? | dorsal aspect of base of 3rd metacarpel |
E. Carpi radialis brevis innervation? | Deep branch of radial nerve (C7,C8) |
E. Carpi radialis brevis action? | extend and ABduct hand at wrist |
E. digitorum origin? | Lateral epicondyle of humerus |
E. digitorum insertion? | extensor expansions of medial 4 fingers |
E. digitorum innervation? | posterior interosseous nerve (C7,C8) |
E. digitorum action? | extends medial 4 fingers at metacarpophalangeal joint; somewhat at interphalangeal joints |
E. digiti minimi origin? | Lateral epicondyle of humerus |
E. digiti minimi insertion? | extensor expansion of 5th finger |
E. digiti minimi innervation? | posterior interosseous nerve (C7,C8) |
E. digiti minimi action? | extends 5th finger at metacarpophalangeal joint; somewhat at interphalangeal joints |
E. carpi ulnaris origin? | lateral epicondyle of humerous and posterior border of ulna via shared aponeurosis |
E. carpi ulnaris insertion? | dorsal aspect of base of 5th metacarpel |
E. carpi ulnaris innervation? | posterior interosseous nerve (C7,C8) |
E. carpi ulnaris action? | extends adn ADDucts hand at wrist (also active when hand is clenched) |
Supinator origin? | lateral epicondyle, radial collateral and annular ligaments, supinator fossa, crest of ulna |
Supinator insertion? | proximal 1/3 of radius |
Supinator innervation? | deep branch of radial nerve (C7,C8) |
Supinator action? | supinates forearm, rotates radius back to anatomical position |
Extensor indicis origin? | posterior surface of distal 1/3 of ulna, interosseous membrane |
Extensor indicis insertion? | extensor expansion of 2nd finger |
Extensor indicis innervation? | posterior interosseous nerve (C7,C8) |
Extensor indicis action? | independent extension of 2nd finger, also aids in extension of hand at wrist |
ABductor pollicis longus origin? | post surface of proximal 1/2 of lna and radius, interosseous membrane |
ABductor pollicis longus insertion? | base of 1st metacarpel |
ABductor pollicis longus innervation? | posterior interosseous nerve (C7,C8) |
ABductor pollicis longus action? | ABducts thumb and extends at carpometacarpal joint |
Extensor pollicis brevis origin? | post surface of distal 1/3 or radius, interosseous membrane |
Extensor pollicis brevis insertion? | dorsal aspect of base of proximal phalanx of thumb |
Extensor pollicis brevis innervation? | posterior interosseous nerve (C7,C8) |
Extensor pollicis brevis action? | extends proximal phalanx of thumb at metacarpophalangeal joint, extends carpometacarpal joint |
Extensor pollicis longus origin? | post surface of middle 1/3 or ulna, interosseous membrane |
Extensor pollicis longus insertion? | dorsal aspect of base of distal phalanx of thumb |
Extensor pollicis longus innervation? | posterior interosseous nerve (C7,C8) |
Extensor pollicis longus action? | extends distal phalanx of thumb at interphalangeal joint,extends metacarpophalangeal and carpometacarpel joints |
Muscles of anatomical snuff box? | 1)ABductor pollicis longus 2)Extensor pollicis brevis 3)Extensor pollicis longus |