Wrist Extensors

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Other Names Forearm (outer or back) Hand Extensors Heads Extensor Digitorum Extensor Carpi Radialis Longus Extensor Carpi Radialis Brevis Extensor Carpi Ulnaris Extensor Indicis Extensor Digiti Minimi Entensor Pollicis Longus Extensor Pollicis Brevis Movement Wrist Extension [1, 2, 3, 4, 5, 6, 7] Abduction [2, 3, 7, 8] Adduction [4] Fingers Extension Index [1, 5] Middle [1] Ring [1] Little [1, 6] Abduction Index [1, 5] Middle [1] Ring [1] Little [1, 6] Thumb Extension [7, 8] Elbow (very weak) Extension [1, 2, 3, 4] Attachments Origin Humerus (Lateral Distal) Lateral Epicondyle [1, 2, 3, 4, 6] Ulna (Posterior Lateral) [5, 7] Radius (Medial Lower Middle) [8] Insertion Fingers (Dorsal) Four Fingers [1] Second & Third Phalanges Index [5] Proximal Phalanx Extensor Expansion Little [6] Proximal Phalanx Thumb (Dorsal) Base of Distal Phalanx [7] Base of Proximal Phalanx [8] Metacarpals (Dorsal) Second [2] Third [3] Fifth [4]

Comments The triarticulate [1] and biarticulate [2, 3, 4, 5, 6, 7, 8 ] wrist extensor muscles may independently enter passive insufficiency through the completion of one of 4 eccentric joint movements (opposite movements of the wrist, fingers, thumb, elbow) when an adjacent joint eccentric movement is sustained. The triarticulate and biarticulate wrist extensor muscles may independently enter active insufficiency through the completion of one of 4 concentric joint movements (movements of the wrist, fingers, thumb, elbow) when an adjacent joint concentric movement is sustained.