Jaw teeth - dentition

Japanese: 顎歯 - がくし
Jaw teeth - dentition


[Invertebrate Jaw]
Invertebrate jaws are generally formed by the hardening of cuticle secreted from the epidermis. Cephalopods have beak-like jaw teeth (commonly known as crows) in their oral cavity, which interlock dorsoventrally. Rotifers have a pair of tooth-like jaws on the inside of their pharynx, one on each side.

From [Teeth]

… In bony fishes, the characteristics of teeth are extremely diverse, and it is difficult to give a general generalization. Teeth include not only marginal teeth that grow around the jawbone, but also palatine teeth that grow on the bones of the palate, such as the vomer and ectopterygoid, in the upper jaw; these are collectively called jaw teeth. In addition, teeth can grow on the skeletons of the pair of gill arches, called the pharyngeal bones, and these are called pharyngeal teeth. …

*Some of the terminology that mentions "jaw teeth" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:


【無脊椎動物のあご】
 無脊椎動物のあごは,一般に表皮から分泌されたクチクラ質が硬化して形成されたものである。頭足類には口腔内にくちばし状の顎歯(がくし)(俗にいうからすとんび)があり,背腹方向にかみ合わされる。輪虫類には咽頭内面に左右1対の歯列状のあごがある。…

【歯】より

… 硬骨魚類では歯の特徴はきわめて多様で,一般的な通性をあげることは難しい。歯は顎骨の周囲にはえている〈辺縁歯〉だけでなく,上あごには鋤骨(じよこつ)や外翼状骨など口蓋の諸骨にはえる〈口蓋歯〉があり,これらを合わせて〈顎歯〉という。このほか咽頭骨と呼ばれる左右1対の鰓弓(さいきゆう)の骨格に歯がはえていることもあって,これらを〈咽頭歯〉という。…

※「顎歯」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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