Sciatic nerve (sciatic nerve)

Japanese: 坐骨神経(座骨神経) - ざこつしんけい（英語表記）sciatic nerve

A nerve that controls the lower limbs. It is the thickest and longest of all human peripheral nerves, about as thick as the shaft of a pencil, and is said to be able to withstand tension greater than the body's weight without being ruptured. The nerve fibers that make up this nerve are mainly those contained in the anterior branches of the fourth lumbar nerve to the third sacral nerve. These nerve fibers join the sciatic plexus and then combine to form the sciatic nerve. In the lower limbs, it controls the flexors of the upper leg and all the muscles of the lower leg and foot, and is also distributed to the skin of the lower leg (except the inner surface) and foot.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

下肢を支配する神経。ヒトの末梢神経のなかでは最も太くて長い神経で，鉛筆の軸よりも太いくらいで，体重以上の張力をかけても肉眼的には断裂しないといわれる。この神経を形成する神経繊維は，主として第4腰神経から第3仙骨神経までの前枝に含まれる神経繊維である。これらの神経繊維は坐骨神経叢に加わり，次いで坐骨神経としてまとまるのであるが，下肢においては上腿の屈筋群と下腿･足のすべての筋群を支配し，また下腿(内側面を除く)と足の皮膚に分布する。

出典　株式会社平凡社世界大百科事典第２版について　情報

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