Muscles Posterior Forearm Flashcards
Brachioradialis Origin
Distal humerus
(Not on common bundle)
(Lateral border of elbow fossa)
Brachioradialis Insertion
Doesn’t cross wrist joint. Inserts just below
Brachioradialis Action
acts on elbow
Extensor carpi radialis longus Origin
Above common extensor bundle on distal shaft of humerus
Extensor carpi radialis longus Insertion
Proximal hand
Extensor carpi radialis longus Inneravtion
Radial nerve
Extensor carpi radialis longus Action
1) Primarily extending hand at wrist
2) Can abduct the hand at wrist
Abductor pollicis longus Action
Abduct thumb
Extensor policis brevis AND longus
Radial nerve
Extensor policis brevis AND longus
Extend thumb
Extensor digitorum Origin
Common extensor origin
Later epicondyle of humerus
Extensor digitorum Insertion
Big belly that divides into several tendons through digits 2-5
Extensor digitorum Action
Extensor digitorum
Extensor digiti minimi Action
Extend digit 5 (pinky)
Extensor carpi ulnaris Insertion
Proximal hand
Extensor carpi ulnaris innervation
radial nerve
Extensor carpi ulnaris action
1) Extends hand at wrist
2) Can also adduct (because we’re on ulnar side)
Flexor carpi ulnaris innervation
radial nerve
Flexor carpi ulnaris action
flex hand at wrist
Anconeus Origin
lateral epicondyle
Anconeus Insertion
Olecranon (proximal shaft of humerus)
Anconeus innervation
Radial nerve
Anconeus Action
Assists triceps in extension of forearm
Extensor pollicis brevis insertion
Extends to the thumb
Extensor pollicis brevis action
Extends thumb
Extensor indicis innervation
radial nerve
Extensor indicis action
extends pointer finger
Supinator origin
proximal ulna
Supinator insertion
proximal radius
Supinator action
1) supination
2) assist biceps brachii
