突触前神经元必须存在神经递质。
A neurotransmitter must be present within the presynaptic neuron.
TCP神经元的树突通常分别与轴突末端和突触前树突形成轴突突触和树突突触。
The dendrites of the TCP neurons usually make axodendritic synapses and dendrodendritic synapses with axonal terminals and presynaptic dendrites, respectively.
免疫电镜还显示有TH阳性神经元胞体和轴突末梢，后者可作为突触前成分与TH阴性结构形成突触。
Especially, there were TH-like positive cell bodies and axonal endings which formed synapses as presynaptic elements with th negative postsynaptic structures.
来自海马下托复合体皮质投射神经元轴突终末，在丘脑前核与投射至海马下托皮质的神经元树突形成非对称性轴-树突触。
In anterior thalamic nucleus corticothalamic projection neuron terminals form asymmetric synaptic contacts with HRP-labelled thalamocortical projection neurons by axo-dendritic synapses.
锌离子随着神经元的活动从突触前膜的囊泡中释放到突触间隙，对突触内受体进行调控。
This divalent cation is released from presynaptic vesicles into the synaptic cleft upon neuronal activity and acts as a modulator of many ligand-gated ion channels.
传入性肌肉内神经节突触前抑制作用的减弱影响了那些支配拮抗肌传入性的中间神经元对拮抗肌的抑制作用，导致了这种互相抑制作用的衰减。
This decreased reciprocal inhibition is due to reduced presynaptic inhibition of the muscle afferent input onto the inhibitory Ia interneuron innervating the muscle antagonist to the input.
传入性肌肉内神经节突触前抑制作用的减弱影响了那些支配拮抗肌传入性的中间神经元对拮抗肌的抑制作用，导致了这种互相抑制作用的衰减。
This decreased reciprocal inhibition is due to reduced presynaptic inhibition of the muscle afferent input onto the inhibitory Ia interneuron innervating the muscle antagonist to the input.
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