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Extensor tendon compartments of the wrist are anatomical tunnels on the back of the wrist that contain tendons of muscles that extend (as opposed to flex) the wrist and the digits (fingers and thumb). The extensor tendons are held in place by the extensor retinaculum. As the tendons travel over the posterior (back) aspect of the wrist they are enclosed within synovial tendon sheaths. These sheaths reduce the friction to the extensor tendons as they traverse the compartments that are formed by the attachments of the extensor retinaculum to the distal (far end) of the radius and ulna. The compartments are numbered with each compartment containing specific extensor tendons. ==Anatomy== ;Compartment 1 : :Conducts the abductor pollicis longus and the extensor pollicis brevis tendons. These tendons form the lateral (thumb side) border of the anatomical snuff box. ;Compartment 2: :Conducts the extensor carpi radialis longus and extensor carpi radialis brevis tendons. ;Compartment 3: :Conducts the extensor pollicis longus tendon that acts to extend the thumb. It forms the medial (little finger) side of the border of the anatomical snuff box. ;Compartment 4: :Conducts the extensor digitorum and extensor indicis tendons to the four fingers. ;Compartment 5: :The extensor digiti minimi tendon travels through this compartment to the little finger. ;Compartment 6: :Conducts the extensor carpi ulnaris tendon. This muscle both extends and adducts (hand flexes toward little finger side) the hand. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Extensor tendon compartments of the wrist」の詳細全文を読む スポンサード リンク
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