BIOL 3755 Chapter Notes - Chapter 6: Axon Hillock, Peripheral Nervous System, Myelin

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27 Feb 2020
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Chapter 6 neuronal signaling and structure of nervous system. If axons are severed, they can repair themselves and restore significant function provided that damage occurs outside cns and does not affect neuron"s cell body: spinal injuries typically crush rather than cut tissue, leaving axons intact. Functional classes of neurons: neurons are classified in 3 ways, afferent neurons transmit info into cns from receptors at their peripheral endings, efferent neurons transmit info out of cns to effect cells. Interneurons lie entirely within cns and form circuits with other interneurons or connect afferent and efferent neurons: neurotransmitters, which are released by presynaptic neuron and combine with protein receptors on postsynaptic neuron, transmit info across synapse. Glial cells: cns also contains glial cells, which help regulate extracellular fluid composition, sustain neurons metabolically, form myelin and blood brain barrier, serve as guides for developing neurons, provide immune functions, and regulate cerebrospinal fluid.

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