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The contrahentes (singular contrahens) are muscles widely present in the hands of mammals, including monkeys. They are on the palmar/plantar side. There is one each for digits I II IV V but not III. They pull the fingers/toes down and together. ==Human anatomy== In humans, the adductor pollicis muscle (and the adductor hallucis in the foot) is a well-developed remnant of the first contrahens though it has lost the insertion on the distal phalanx of the thumb. 〔 The other contrahentes only appear as rare atavistic abnormalities. In other mammals, the contrahentes may have their origin either on the carpus or the metacarpus, which suggests that the palmar interossei muscles also contain elements of the contrahentes. 〔 They appear in the human fetus as a layer of flesh which mostly disappears. 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「Contrahens」の詳細全文を読む スポンサード リンク
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