MuscleOriginInsertionNerve supplyActiontriceps •long head •lateral head •medial head •infraglenoid tubercle ofscapula •upper lateral aspect ofhumerus •lower medial aspect ofhumerus olecranon process ofulna radial extends arm and forearm Anconeus (not important accessory extensor) back of lateral epicondyle ofhumerusolecranon process of ulna radial extends forearm Superficial: brachioradialis lateral supracondylarridge of humerus styloid process ofradius radial flexes forearm and supinates hand extensor carpi radialis longus lateral supracondylarridge of humerus base of2nd metacarpal radial extends and abducts the wrist extensor carpi radialis brevis lateral epicondyle ofhumerus base of3rd metacarpal radial extends and abducts the wrist extensor carpi ulnaris lateral epicondyle ofhumerus posterior border ofulnabase of5th metacarpal radial extends and adducts the hand Intermediate: extensor digitorum lateral epicondyle ofhumerus extensorexpansion overfingers radial extends fingers, hand and forearm extensor digiti minimi lateral epicondyle ofhumerus extensorexpansion of little fingerradial extends little fingerDeep: supinatorlateral epicondyle ofhumerus crest of ulnaupperthird ofradius radial supinates the hand
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