An invertebrate statocyst. In crustaceans, it is located at the base of the antennae, and its inner surface contains a group of sensory cells with sensory hairs that arise from them. The statocyst usually contains a secreted statolith or several grains of sand taken in from the outside world. When the animal's body is tilted, the statolith or sand grain comes into contact with the sensory hairs, which are distorted, exciting the sensory cells and generating an impulse. The physiological function of the statocyst in the spiny lobster in particular has been well studied. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
無脊椎動物の平衡器官。甲殻類では触角の基部にあり,その内面には一群の感覚細胞があって,それから生じた感覚毛がそなわっている。通常胞内には分泌された1個の平衡石または外界から取入れられた数個の砂粒がある。動物の体が傾斜したとき,平衡石または砂粒が感覚毛に触れ,それがひずみを受けることによって感覚細胞が興奮しインパルスが発生する。特にイセエビの平衡胞の機能については生理学的によく調べられている。
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