Norekian T P, Satterly R
Zh Vyssh Nerv Deiat Im I P Pavlova. 1991 Sep-Oct;41(5):982-97.
Neurones of the cerebral ganglia controlling the movements of the hunting apparatus of predatory pelagic mollusc Clione limacina are described in detail. A large group is identified of high-threshold electrically interconnected neurones A, the impulse activity of which leads to the opening of the skin folds and throwing forward Clione catching tentacles. Neurones of B group, having constant background activity and receiving powerful inhibitory inputs from A cells, on the contrary, elicit contraction and drawing in of the hunting tentacles inside the head. The third group--C neurons, the impulse activity of which leads to tightening of the skin folds covering the hunting apparatus. The action has been studied on identified neurones of such transmitters as serotonine, dopamine and gamma-aminobutyric acid. Serotonine depolarises both A and B neurones, but activation of the hunting apparatus is an integrating effect: activated neurones A owing to powerful TPSP inhibit neurones B, interrupting direct exciting action of serotonine. Dopamine in different concentrations has an opposite effect: at low concentrations only B cells are activated and tentacles are drawn inside the head; at high ones the neurones A start working which inhibit B cells and activate the hunting apparatus. GABA renders to neurones, regulating the movements of the hunting apparatus a total, well coordinated action directed to activation of the hunting behaviour: it depolarises-activates A neurones and hyperpolarises-inhibits neurones of B and C groups.
详细描述了控制掠食性远洋软体动物海天使（Clione limacina）捕食器官运动的脑神经节神经元。识别出一大组高阈值电互连神经元A，其冲动活动会导致皮肤褶皱张开并向前伸出海天使的捕捉触手。相反，B组神经元具有持续的背景活动并从A细胞接收强大的抑制性输入，会引发捕猎触手在头部内收缩并缩回。第三组——C神经元，其冲动活动会导致覆盖捕食器官的皮肤褶皱收紧。研究了血清素、多巴胺和γ-氨基丁酸等递质对已识别神经元的作用。血清素使A和B神经元都去极化，但捕食器官的激活是一种整合效应：被激活的A神经元由于强大的突触后电位抑制B神经元，中断血清素的直接兴奋作用。不同浓度的多巴胺有相反的作用：低浓度时仅激活B细胞并使触手缩回头部；高浓度时神经元A开始工作，抑制B细胞并激活捕食器官。γ-氨基丁酸对调节捕食器官运动的神经元产生全面、协调良好的作用，旨在激活捕食行为：它使A神经元去极化并激活，使B和C组神经元超极化并抑制。
