External mesenchyme - external mesenchyme

Japanese: 外性間充織 - がいせいかんじゅうしょく
External mesenchyme - external mesenchyme

…It is a type of connective tissue that forms between the ectoderm and endoderm during the early development of an animal. It is distinguished from the densely arranged germ layers by its sparse clusters of star-shaped cells with processes. Depending on whether it is derived from the ectoderm or the endoderm, it is divided into external mesenchyme and internal mesenchyme. Mesenchyme is an important cell group that participates in the formation of the connective tissue system of various tissues and organs, but some invertebrates such as sponges and jellyfish have mesenchyme even in adulthood. …

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

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…動物の個体発生初期に外胚葉と内胚葉との間に形成される一種の結合組織で,突起をもつ星形の細胞がまばらな集団をつくっているので,密な細胞配列をなす胚葉と区別される。外胚葉と内胚葉のいずれに由来するかで,それぞれ外性間充織exomesenchymeと内性間充織endomesenchymeに分けられる。間充織はさまざまな組織や器官の結合組織系の形成にあずかる重要な細胞集団であるが,無脊椎動物のカイメンやクラゲには成体になっても間充織をもつものがある。…

※「外性間充織」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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