Muscles of Posterior compartment of forearm Flashcards
Brachioradialis Origin
Lateral supra-epicondylar ridge of humerus
Brachioradialis Insertion
Lateral surface of distal end of radius, proximal to styloid process
Brachioradialis Action
- Weak flexion of forearm
* Maximal when forearm is in midpronated position
Extensor carpi radialis longus Origin
Lateral supra-epicondylar ridge of humerus
Extensor carpi radialis longus Insertion
Dorsal aspect of base of 2nd metacarpal
Extensor carpi radialis longus Action-2
- Extend wrist
- Abduct hand (Radial Deviation)
Extensor carpi radialis brevis Origin
Lateral epicondyle of humerus
Extensor carpi radialis brevis Insertion
Dorsal aspect of base of 3rd metacarpal
Extensor carpi radialis brevis Action-2
- Extend wrist
- Abduct hand (Radial deviation)
*When fist is clenched
Extensor digitorum Origin
Lateral epicondyle of humerus
Extensor digitorum Insertion
Extensor expansions of medial 4 fingers
Extensor digitorum Action
Extends medial 4 fingers at both the metacarpophalangeal joints and interphalangeal joints
Extensor digiti minimi Origin
Lateral epicondyle of humerus
Extensor digiti minimi Insertion
Extensor expansion of 5th finger
Extensor digiti minimi Action
Extends 5th finger at both the metacarpophalangeal joints and interphalangeal joints