Pit organ

...Similar structures are also found in the auditory and equilibrium organs of the inner ear of higher animals. The neuromasts that line the lateral line canal that runs under the epidermis are called canal organs, and the neuromasts scattered in the invaginations of the skin are called pit organs. Cyclostomes only have free neuromasts that are exposed on the body surface.

*Some of the terminology that mentions "pit organ" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…このような構造は高等動物の内耳の聴器や平衡器にもみられる。表皮下を走る側線管内に並ぶ感丘を管器canal organ，皮膚の陥入部に散在する感丘を孔器pit organと呼ぶ。円口類では体表に露出する遊離感丘しかない。…

※「pit organ」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