Summary Properties of Synapses

Property

Distance between pre- and postsynaptic cell membranes Cytoplasmic continuity between pre- and postsynaptic neurons? Ultrastructural components

Mechanism of transmission

Synaptic delay Direction of transmission

Electrical Synapses

Gap junction channels, i.e., connexins

Ionic currents

Negligible

Generally bidirectional

Chemical Synapses 16-20 nm

Presynaptic vesicles, mitochondria, postsynaptic receptors Release and diffusion of chemical neurotransmitter 0.3-5 ms, depending Generally unidirectional

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