Short radius of extensor carpus
Short radius of the extensor carpus , m. Extensor carpi radialis brevis, is somewhat covered by the previous muscle in the proximal part, and in the distal part it is intersected by passing more superficially retracting and extensor muscles. The muscle originates from the lateral epicondyle of the humerus, the radial collateral ligament of the annular ligament of the radius. Going down, passes into the tendon, which lies next to the tendon of the previous muscle in the vagina of the sinews of the extensor carpal, vagina tendinum mm. Extensorum carpi radialium, attached to the base of the third metacarpal bone. At the attachment point of the tendon lies a small bag of the short radius of the extensor carpenter, bursa m. Extensoris carpi radialis brevis.
Function: unbends the brush and retracts it several times.
Innervation: n. Radialis [(CV) CVI-CVII].
Blood supply: a. Radialis, a. Recurrens radialis.
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