Forearm Extensor Muscles

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  • Common extensor origin = anterior aspect of lateral epicondyle  
Muscle Origin Insertion Nerve Action Notes
extensor carpi radialis longus lower part of lateral supracondylar ridge dorsal aspect of base of 2nd metacarpal radial extends and abducts wrist  
extensor capri radialis brevis common extensor origin 3rd metacarpal radial extnends and abducts wrist  
extensor carpi ulnaris common extensor origin 5th metacarpal radial extends and adducts wrist  
extensor digitorum common extesor origin extensor expansions radial extends fingers  
extensor digiti minimi common extensor origin extensor expansion of little finger` radial extends little finger  
abductor pollicis longus ulna 1st metacarpal radial abducts thumb  

form anatomical snuff box
extensor pollicis brevis ulna proximal phalanx of thumb radial extends proximal joint of thumb
extensor pollicis longus ulna distal phalanx of thumb radial extends distal joint of thumb
hooks around dorsal tubercle of radius
supinator lateral epicondyle,
supinator crest		 proximal third of anterior aspect of radius radial supination of forearm radial nerve passes between two layers

 

 

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