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In human anatomy, the ligament of the head of the femur (round ligament of the femur or the foveal ligament) is a ligament located in the hip. It is triangular in shape and somewhat flattened. The ligament is implanted by its apex into the antero-superior part of the fovea capitis femoris and its base is attached by two bands, one into either side of the acetabular notch, and between these bony attachments it blends with the transverse ligament.〔''Gray's Anatomy'' (1918), see infobox〕 It is ensheathed by the synovial membrane, and varies greatly in strength in different subjects; occasionally only the synovial fold exists, and in rare cases even this is absent.〔 The ligament of the head of the femur contains within it the acetabular branch of the obturator artery. ==Function== The ligament is made tense when the thigh is semiflexed and the limb then abducted or rotated outward; it is, on the other hand, relaxed when the limb is adducted.〔 Research suggests it contributes little influence as a ligament past childhood, although it may still be important in transmitting arterial supply to the head. In humans, it has been suggested that it is not the ligamentum teres but the hip capsule (specifically the iliofemoral, ischiofemoral and pubofemoral ligaments) that provides the primary resistance to dislocation in the extended hip. However, recent research has suggested the ligamentum teres of the femur may have a number of functions, including a significant biomechanical role on the basis of cadaveric studies where increases of range of motion were seen after sectioning of the ligament.〔(), O'Donnell, J. M., Pritchard, M., Salas, A. P., & Singh, P. J. (2014). The ligamentum teres--its increasing importance. Journal of Hip Preservation Surgery, 1(1), 3-11. doi: 10.1093/jhps/hnu003〕 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「ligament of head of femur」の詳細全文を読む スポンサード リンク
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