ANP 1106 Chapter 11 & 12: Nervous System (the Brain)
2 Mar 2017
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Document Summary
Histology of nervous tissue very cellular (cells are densely packed), minimal extracellular matrix; 2 principal types of cells: supporting cells or neuroglia (6 types) neurons associate closely with smaller cells. In pns (2 types): satellite cells surround neuron cell bodies in ganglia; influence chemical environment of these neurons (similar to what astrocytes do but in pns) Schwann cells form myelin sheaths around larger neurons in pns, vital to peripheral nerve cell regeneration; many schwann cells on axons of neurons: neurons conduct message via nerve impulses throughout body. Structural classification of neurons according to number of processes extending from cell body. Multipolar 3+ processes (1 axon and many dendrites); most abundant, major neuron type in cns to allow multiple paths to receive sensory info & coordinate motor info i. e purkinje cell of cerebellum, pyramidal cell. Bipolar 2 processes (a dendrite and one axon on opposite sides of cell body); rare, found in special organs (olfactory, mucosa, eye, ear)
