Anatomy and Cell Biology 3319 Chapter Notes - Chapter 12: Schwann Cell, Grey Matter, Myelin

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Voluntary ns: visceral motor: a. k. a. autonomic nervous system, involuntary motor innervation (smooth muscle, cardiac, glands) Involuntary ns: contraction of smooth/cardiac muscle, secretion of glands, autonomic ns (controlling visceral organ function), sympathetic division fight or flight, parasympathetic conserving energy, promoting digestion. Nervous tissue: 2 main types of cells, cells densely packed, tightly intertwined, neurons transmit electrical signals, neuroglia surround/wrap neurons. Enlarged surface area for: extend from cell bodies, dendrites, neuron processes receiving signals, conduct electrical signals toward cell body, axons, 1 per neuron, arises from cone shaped region of cell body axon hillock, thin processes, uniform diameter. Readings: presynaptic side terminal bouton has synaptic vesicles, abundant mitochondria secretion of vesicles requires (membrane bound sacs with neurotransmitters), transmit signals across the synapse, pm of both neurons separated by synaptic cleft, function energy. Readings: motor neurons efferent, motor division of pns, carry impulse away from cns to effector organs, multipolar, cell bodies in cns, form junctions with effector cells, stimulate muscles/glands.

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