Nuchal ligament - Nap ligament

Japanese: 項靱帯 - うなじじんたい
Nuchal ligament - Nap ligament

…The skin in this area is very thick, and hair grows in some of the upper parts. Under the skin, between the spinous processes of the spine and the occipital bone, there is an elastic ligament called the nuchal septum (or nuchal ligament), which holds the head back like a rubber band and prevents it from bending forward. On both sides of the nuchal septum, there are embankments of muscles (mainly the transverse occipitalis muscles), so there is a depression in the midline of the outer surface of the nape of the neck called the 'bon no kubo' (dimple in the neck).

*Some of the terminology explanations that mention the "nuchal ligament" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…この部の皮膚ははなはだ厚く,上方の一部には頭髪がはえている。皮下には脊柱の棘突起と後頭骨との間に項中隔(または項靱帯(じんたい))という弾性靱帯があって,頭が前へのめるのをゴムのひものように後方へ引きとめている。項中隔の両側には筋肉(主として横突後頭筋)が堤防状に走っているため,うなじの外表には正中部に〈ぼんのくぼ〉というへこみがある。…

※「項靱帯」について言及している用語解説の一部を掲載しています。

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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