Mantle cavity - Gaitokou

Japanese: 外套腔 - がいとうこう

…In particular, in cephalopods, the color of the body changes due to the action of chromatophores distributed in the cortex that covers the surface of the mantle, and the unevenness of the body surface can also be changed by muscle contraction. The space formed by the mantle is called the mantle cavity, but it is connected to the outside world and is not a body cavity. In addition to gills, the mantle cavity also has an anus and an outlet for excreting reproductive materials, and the intake of water for breathing and the excretion of waste materials are all performed by a combination of contraction and relaxation of the mantle or ciliary flow. …

*Some of the terminology that mentions the "mantle cavity" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…とくに頭足類では，外套膜表面をおおう皮層に分布する色素胞の作用により体色の変化を起こし，また筋肉の収縮などによって体表の凹凸も変えることができる。外套膜が形づくる空所は外套腔mantle cavityと呼ばれるが，外界と通じていて体腔ではない。外套腔には鰓（えら）があるほか，肛門や生殖物質の排出口もあり，呼吸水の吸入や不用物の排出などはいずれも外套膜の収縮弛緩あるいは繊毛流との組合せによって行われる。…

※「外套腔」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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