neurons

• Morphological Classification of Neurons → multipolar (one axon, many dendrites) → bipolar (one axon, one dendrite) → unipolar → single axon that branches to peripheral axon and central axon. Specialised dendrites responding to specific sensory modality)

  
• Conduction velocity is higher in large diameter axons.

  
• fastest conducting myelinated axons are sensory from mechanoreceptors in skin & muscles (~80-120m/s). slowest are unmyelinated sensory axons heat and pain info (~1m/s)
• Following a spike, the excitable membrane will enter to a refractory period, during which the threshold to initiate a second spike is increased.
• Chemical synapse → neurotransmitter

  Presynaptic site: axon terminal of presynaptic neuron

  Postsynaptic site (dendrite of postsynaptic cell)

  Synaptic cleft (gap)