第三転子とは
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右大腿骨
（後面上端） |
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「船戸和弥のホームページ」には以下のような解説が見られる。
「臀筋粗面が著しく高くなって第三転子をつくることがある。日本人では３０％近くに見られるというが、どのくらい発達すれば第三転子と呼ぶのか基準の定めかた次第でこの頻度は変わってくる。」
また、以下が「Wikipedia」の解説となる。
「In human anatomy, the third trochanter is a bony projection occasionally present on the proximal femur near the superior border of the gluteal tuberosity. When present, it is oblong, rounded, or conical in shape and sometimes continuous with the gluteal ridge. It generally occurs bilaterally without significant side to side dimorphism. [1] A structure of minor importance in humans, the incidence of the third trochanter varies from 17–72% between ethnic groups and it is frequently reported as more common in females than in males. Structures analogous to the third trochanter are present in other mammals, including some primates. [2] It is called the third trochanter in reference to the greater and lesser trochanters that are always present on the femur.
Its function is to provide an attachment for the ascending tendon of the gluteus maximus muscle. It may function as (1) a reinforcement mechanism for the proximal femoral diaphysis in response to increased ground reaction force and (2) to increase the attachment surface area for the gluteal musculature and thereby providing greater efficiency of contracture. Mechanical load from the gluteus maximus may, on the other hand, affect the morphology of the proximal femur, similar to how quadriceps determines the size and shape of the tibial tuberosity, and thereby the shape of the third trochanter.」
■ 付着するもの ■
筋 肉 |
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gluteus maximus muscle |
【参考になるサイト】
・写真を掲載しているサイト-Ⅰ
・写真を掲載しているサイト-Ⅱ
・写真を掲載しているサイト-Ⅲ（矢印は転子間稜）
