BIO 212 Lecture Notes - Lecture 14: Dementia, Ventral Root Of Spinal Nerve, Defecation

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Ch 16: the autonomic nervous system and higher-order functions. Autonomic nervous system: organization of the ans, integrative centers, for autonomic activity in hypothalamus, neurons comparable to upper motor neurons in sns, visceral motor neurons. Divisions of the ans: the autonomic nervous system, operates largely outside our awareness, has 2 divisions, sympathetic division. Preganglionic fibers release acetylcholine (ach), stimulating ganglionic neurons: target organs, all postganglionic fibers release ach at neuroeffector junctions, parasympathetic stimulation, rest and digest response, sympathetic and parasympathetic division, most often, these 2 divisions have opposing effects. Interconnected masses: organization and anatomy of the parasympathetic division, parasympathetic preganglionic fibers leave brain as components of cranial nerves. Parasympathetic neurons release ach: neuromuscular and neuroglandular junctions, all release ach as neurotransmitter, small, with narrow synaptic clefts, effects of stimulation are short lived. Innervates viscera within abdominal cavity: inferior mesenteric plexus, hypogastric plexus, contains, parasympathetic outflow of pelvic nerves, sympathetic postganglionic fibers from inferior mesenteric ganglion, splanchnic nerves from sacral sympathetic chain.

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