nerve fiber Excitement of Synapse or Neuromuscular junction , transmitted to later neurons or muscles, etc Effector , called transmission, in order to communicate with excitement in the nerve or Muscle fibre The conduction process in is different. Transmission is usually unidirectional. According to the transmission direction, the two cells constituting the synapse are divided into presynaptic and postsynaptic. As nervous system The basic process of neuromuscular junction and Spinal reflex It has been studied, but since 1950 Intracellular electrode France has made rapid progress. Eccles (J.C. Eccles, 1963) and Katz (B. Katz, 1970) Electrophysiology And won the Nobel Prize for Physiology. Transmission can be distinguished according to the following three points:
1. Because Synapse Presecretory Chemical transfer Chemical transmission of substances and Action current And delivered Electrotransmission 。 The former is more common, and the latter, especially in mammals central nervous system Has not been confirmed; 2. Post synaptic excitatory Excitatory synapse And inhibiting postsynaptic excitatory Inhibitory synapse , and on the presynaptic nerve end of the excitatory synapse, another synapse is formed at the other nerve end to inhibit the former to secrete chemical transmitters Presynaptic inhibition ； 3. It may also be based on acetylcholine 、 Norepinephrine , r-aminobutyric acid and other chemical transfer substances. [1] 
