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【正文】 the CNS Functional Classification of Neuron ? EXCITABLE Membrane: Able to regulate the movement of ions (charges) across and along membrane SIGNAL TRANSDUCTION ? DO NOT Replicate: Damaged cells cannot be replaced! Important Features of Neurons Action Potential Four Functional Regions of Model Neurons ? Impulse transmission : – electrical – chemical ? Morphology : – axodendritic – axonsomatic – axoaxonic – dendrodendritic Classification of Synapses synapse 4 Vesicles release Neurotransmitters ? Chemical synapse : – presynaptic knob (presynaptic ponent) ? synaptic vesicles – synaptic cleft – postsynaptic membrane (postsynaptic ponent) ? Electrical synapse : – gap junctions Synapse Structures Types of synapse Distance Cytoplasmic continuity Ultrastructural ponent Agent of transmission Synaptic delay Direction of transmission Electrical nm Yes Gapjunction channel Ion current Virtually absent Usually bidirectional Chemical 2040 nm No Presynaptic vesicle and active zone。 receive stimuli and transmit afferent impulses to CNS –Interneurons ? municating between neurons。 branch extensivel
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