…A microscopic structure found in all coelenterates except comb jellies. Many of them exist within an individual animal, and serve the functions of capturing food and defending against predators and other enemies. Cnidocytes are cell organelles contained individually within cells called nemarocytes (cnidoblasts). They are generally spherical or ovoid, but there are more than 20 different types of morphology. The most common of these nematocysts is the penetrating nematocyst (or ordinary nematocyst), which contains a single hollow stinging thread in its lumen. This thread is reversed and projected out by a certain stimulus, and is instantly shot into the body of the target animal, through which the venom in the lumen is injected. … *Some of the terminology that mentions "nemarocyte" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…クシクラゲ類を除く他のすべての腔腸動物にみられる顕微鏡的な構造物で,一動物個体内に多数が存在し,食物の捕捉や,捕食者また妨害者など敵に対する防衛の役割をもっている。刺胞は刺細胞nemarocyte(cnidoblast)とよばれる細胞内にそれぞれ1個ずつ含まれる細胞器官で,一般には球形ないし卵形などであるが,その形態には20余種類の型が区別されている。これら刺胞のうち最もふつうのものは貫通刺胞(または普通刺胞)とよばれるもので,その内腔中に1本の中空の刺糸を内蔵しており,この刺糸がある刺激によって反転して翻出し,一瞬のうちに相手動物の体内へ打ち込まれ,その刺糸を通って内腔中の毒液が注射される。… ※「nemarocyte」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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