Name Extensor carpi radialis brevisPronunciation (eks-TEN-sor KAR-pi ra-de-A-lus BREV-is) Origin/Proximal Attachment Lateral epicondyle via the common extensor tendon; radial collateral ligament; antebrachial fascia Insertion/Distal Attachment Base of 3rd metacarpal Action/Relevance Extends the hand at the wristRadially deviates the hand at the wrist Innervation Radial nerve - deep branch (C7,8) | 
