CAS BI 108 Lecture Notes - Lecture 9: Inhibitory Postsynaptic Potential, Neuroglia, Peripheral Nervous System

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Central nervous system (brain and spinal cord) Peripheral nervous system (cranial and spinal nerves) Oligodendrocytes (central nervous system) & schwann cells (peripheral nervous system) If a cell body is injured, the neuron is likely to die. If a peripheral nerve is severed, its distal portion may regenerate and reestablish its former connections. Significant regeneration is unlikely in the cns. ~ 100,000 presynaptic terminals lie on dendrites of a cell. Impulses travel from dendrite on cell body through axon to presynaptic terminal. Axons secrete neurotransmitter from synaptic vesicles in knobs on axon when receives an impulse. When transmitter reaches postsynaptic neuron it triggers an synaptic potential. Neurotransmitters are quickly removed or decomposed from synaptic clefts. Some transmitters cause action potentials, excitatory postsynaptic potential (epsp) Others can inhibit action impulses, inhibitory postsynaptic potential (ipsp) Brain structure reflects the way it was formed. Brain develops from a tube with 3 cavities: forebrain, midbrain, hindbrain. The brain has three major parts to it:

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