omasum

Japanese: omasum
omasum

…Rumination is the process of regurgitating the contents of the stomach into the mouth, rechewing them, mixing them with saliva, and swallowing them again. The stomach of ruminants such as cattle, giraffes, deer, and mouse deer is generally called the ruminant stomach, and consists of four chambers: the first stomach (rumen), the second stomach (reticulum), the third stomach (omasum), and the fourth stomach (abomasum). However, primitive mouse deer species have no third stomach and only three chambers. …

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

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…胃内容を口腔に吐きもどして再そしゃくし,唾液(だえき)と混合させて再び嚥下(えんげ)することを反芻ruminationという。ウシ,キリン,シカ,マメジカなどの反芻類の胃を一般に反芻胃といい,第一胃(こぶ胃)rumen,第二胃(蜂巣(ほうそう)胃)reticulum,第三胃(重弁胃)omasum,第四胃(皺胃(しゆうい))abomasumの4室よりなる。ただし原始的なマメジカ類では第三胃がなく3室である。…

※「omasum」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。

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