…Synapses are classified into electrical synapses and chemical synapses based on the difference in the mode of excitation transmission, but there are few examples of electrical synapses. Mammalian synapses are usually chemical synapses, and excitation transmission is carried out via chemical substances (chemical transmitters). The presynaptic element of a chemical synapse, i.e. the axon terminal, is a collection of synaptic vesicles (diameter 30-60 nm) containing chemical transmitters, and the cell membrane of the axon terminal faces the cell membrane of the dendrite or cell body of the next neuron through a gap (synaptic cleft) 20-30 nm wide. … *Some of the terminology that refers to "chemical transmitter" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…シナプスには興奮伝達の様式の違いによって電気シナプスと化学シナプスが区別されているが,電気シナプスの例は少ない。哺乳類のシナプスは通常,化学シナプスであり,興奮伝達は化学物質(化学伝達物質chemical transmitter)を介して行われる。化学シナプスのシナプス前要素,すなわち軸索終末には化学伝達物質を含むシナプス小胞synaptic vesicle(直径30~60nm)が集合しており,軸索終末の細胞膜は次のニューロンの樹状突起ないし細胞体の細胞膜と幅20~30nmの間隙(かんげき)(シナプス間隙synaptic cleft∥synaptic gap)をもって相対している。… ※「chemical transmitter」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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