PSYCO275 Lecture Notes - Lecture 8: Axon Terminal, Membrane Potential, Ligand-Gated Ion Channel
30 Sep 2016
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Document Summary
Action potentials are well suited to signal events over long distances: from the axon hillock to the axon terminal. Transmission of potentials move from the pre-synaptic neuron to the post-synaptic neuron. Electrical synapses transmit any potential from the pre-synaptic neuron to the post- synaptic neuron. They don"t have to be localized at the atonal terminals. Chemical synapses are designed only to transmit action potentials. This is directional, and has specialized anatomical connections. The majority of neuron transmission in the cns tends to be chemical transmission. 3)depending on ltering (and polarity), potential causes change in post-synaptic potential. 4)postsynaptic channels change state, causing current ow changes and thus changes in postsynaptic membrane polarization. Apposed synapse is the site of release close to synaptic contact. The advantage is that you are speci cally targeting one target. Removed synapse is the site of release removed from contact site. The advantage is that there is a huge target base.
