Compare and contrast the function and structure of the sympathetic and parasympathetic divisions of the autonomic nervous system.
Compare:Innervate same organs - sometimes cooperative effects, sometimes contrasting effects; sympathetic effects last longer than parasympathetic - Ach broken down quickly
- Sympathetic - E division, emergency/excitement, decreases blood to digestive, reproductive, skin;
- Parasympathetic - D-division (defecate, digestion, diuresis, sex) - calming effect on body, conserves energy, maintains daily necessary bodily functions
Compare: Body does not shift from one to another - always autonomic tone; degree of symp/para depends on needs of body
- Sympathetic - preganglionic somas in lateral horns, short preganglia nerves, long postganglionic. Preganglionic synapse enter sympathetic chain ganglion, three paths: a) synapse with postsynaptic neuron, b) travel up or down sympathetic chain ganglion to postganglionic neuron, c) pass through chain without synapse to form splanchnic nerve, into collageral ganglion - in to network of abdominal aortic complex.
Parasympathetic - preganglionic axons run to terminal ganglia - close to effector organs. Long preganglionic fibers, short post. No chain ganglion.Less neural divergence;