Pseudopod - kasoku

A temporary protrusion that always forms when amoebae or cultured motile cells perform amoeboid movements; it is a cellular organelle for movement. It is also called pseudopodia, pseudopodia, or virtual podium. Pseudopodia are divided into several types based on their shape and the way the cytoplasm flows. The pseudopodia of amoebas are leaf-shaped with rounded tips, the main flow of cytoplasm is in one direction, and they are mainly used for movement. The pseudopodia of sunworms are thread-like, extend radially from the body, the cytoplasm flows in two opposing directions, and they are mainly used for feeding. The shape and number of pseudopodia change depending on external and internal conditions.

[Ryo Katajima]

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

アメーバや運動性をもつ培養細胞が、アメーバ運動を行うときにかならず形成する一時的突起で、運動のための細胞器官である。擬足、偽足、虚足ともいう。仮足は形状や細胞質の流れ方によって数型に分けられる。アメーバの仮足は葉状で先端が丸く、細胞質の主流は1方向で、おもに移動に携わる。タイヨウチュウの仮足は糸状で、体から放射状に伸び、細胞質は相反する2方向に流れ、おもに捕食に携わる。仮足の形や数は外的および内的条件によって変わる。

［片島　亮］

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