Hypopharynx

Japanese: 下咽頭 - かいんとう
Hypopharynx

...the muscles of the pharynx work together to control swallowing. The pharynx is divided into three parts: the nasopharynx, the oropharynx, and the hypopharynx (Figure).
[Nasopharynx]
The part of the nasal cavity above the level of the palate is called the nasopharynx or nasopharynx, and contains the opening of the Eustachian tube that leads to the middle ear cavity.

From [Mouthparts]

…the mouthparts of crustaceans and myriapods consist of an upper lip, a pair of mandibles, and a pair of first and second mandibles; more advanced species have several pairs of maxillae. In insects, the mouthparts consist of an upper lip, a pair of mandibles, a pair of lower lip, and a tongue, and the pair of lower lips are fused in the middle. The shape of each part varies greatly depending on the insect's order and feeding habits, but they can be broadly divided into chewing and absorptive types.

*Some of the terminology that refers to the "hypopharynx" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…また種々の筋肉が協調して嚥下をつかさどる。咽頭は上咽頭,中咽頭,下咽頭の三つの部分に分けられる(図)。
[上咽頭]
 鼻腔に続く口蓋のレベルより上の部分を鼻咽腔あるいは上咽頭といい,中耳腔に通じる耳管の開口部がある。…

【口器】より

…甲殻類や多足類の口器は一つの上唇,1対の大あご,1対ずつの第1・第2小あごからなり,高等なものには何対かの顎脚が加わる。昆虫類では上唇・大あご・小あご・下唇・下咽頭(舌)からなっていて,1対の下唇は真ん中で癒合する。各部分の形状は昆虫の目(もく)や摂食習性によってひじょうに異なるが,そしゃく型と吸収型とに大別できる。…

※「下咽頭」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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