BIO 121 Lecture Notes - Lecture 13: Myelin, Neuroglia, Schwann Cell
24 Jul 2020
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Do not transmit electrical signals but can release transmitters. Give support during development, supply nutrients, maintain extracellular enviro. Insulate axons, consume debris, prov imm functions. In cns oligodendrocytes prod myelin & insulate axons. In pns schwann cells prod myelin & insulate axons. Communication is electrical within the neuron & chemical between neurons & other cell types. Neuron stores energy in form of potential diff uses it to transmit action potential: sensory detector must convert enviro signals to electrical signals. Presynaptic neuron sends msg via axon terminal. Synaptic cleft = space b/n nerve terminal & postsynaptic cell. Chem signal released from pre-neu binds to receptors on post-syn cell. Neurons can release more than one neu-trans. Stop signal /w enzy that breaks down neu-trans. Neurons hve electric charge diff across their plasma membranes: created by na+, k+ & cl- ions. Neuron not active membrane potential at resting potential. An action potential is a rapid reversal in charge across the plasma membrane.
