The extensor digitorumindicisand extensor digititorum communis are within the 4th compartment.
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The tendon to the index finger is accompanied by the extensorindicisproprius, which lies on its ulnar side.
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In situations when only thumb mobility is desired, the extensorindicisproprius is an ideal transfer.
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The princeps pollicis and radialisindicismay arise from a common trunk termed the first palmar metacarpal artery.
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It divides below into four tendons, which pass, together with that of the extensorindicisproprius, through a separate compartment of the dorsal carpal ligament, within a mucous sheath.
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