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A malleolus〔The word ''malleolus'' (), plural ''malleoli'' (), comes from Latin and means "small hammer". (It is cognate with ''mallet''.)〕 is the bony prominence on each side of the ankle. Each leg is supported by two bones, the tibia on the inner side (medial) of the leg and the fibula on the outer side (lateral) of the leg. The medial malleolus is the prominence on the inner side of the ankle, formed by the lower end of the tibia. The lateral malleolus is the prominence on the outer side of the ankle, formed by the lower end of the fibula. ==Medial malleolus== The medial surface of the lower extremity of tibia is prolonged downward to form a strong pyramidal process, flattened from without inward - the medial malleolus. * The ''medial surface'' of this process is convex and subcutaneous. * The ''lateral'' or ''articular surface'' is smooth and slightly concave, and articulates with the talus. * The ''anterior border'' is rough, for the attachment of the anterior fibers of the deltoid ligament of the ankle-joint. * The ''posterior border'' presents a broad groove, the malleolar sulcus, directed obliquely downward and medially, and occasionally double; this sulcus lodges the tendons of the Tibialis posterior and Flexor digitorum longus. * The ''summit'' of the medial malleolus is marked by a rough depression behind, for the attachment of the deltoid ligament. Structures that pass behind medial malleolus deep to flexor retinaculum: * Tibialis posterior tendon * Flexor digitorum longus * Posterior tibial artery * Posterior tibial vein * Tibial nerve * Flexor hallucis longus 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「Malleolus」の詳細全文を読む スポンサード リンク
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