突触前神经元必须存在神经递质。

A neurotransmitter must be present within the presynaptic neuron.

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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.

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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.

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One is that there's a physical space in between the two cells, so the axon of what's called the pre-synaptic neuron, or the neuron that's bringing a signal into the synapse, the axon terminal is physically separated from the dendrite of the next cell.

一是两个细胞间有一定的物理空间,所谓的突触前神经元,也就是将信号传递到突触的神经元的,轴突的末梢,同下一个细胞的树突间被物理性分离开

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