Short extensor of the thumb of the hand
Short extensor of the thumb of the hand , m. Extensor pollicis brevis, is located in the lower part of the forearm along the lateral margin of its dorsal surface.
The muscle starts from the interosseous membrane of the forearm and the back surface of the radial bone, is sent obliquely down and is located next to the tendon m. Abductor pollicis longus.
The tendons of these two muscles are surrounded by the vagina of the tendons of the long abducent muscle and the short extensor of the thumb of the hand, vagina tendinum mm. Abductoris longi et extensoris brevis pollicis. Passing under the extensor retainer, the muscle is attached to the base of the back surface of the proximal phalanx of the thumb of the hand.
Function: unbends and slightly retracts the proximal phalanx of the first finger of the hand.
Innervation: n. Radialis [CVI-CVII (CVIII)].
Blood supply: a. Interossea posterior, a. Radialis.
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