PHGY 214 Lecture Notes - Lecture 7: Autonomic Nervous System, Enteric Nervous System, Postganglionic Nerve Fibers
12 May 2016
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Document Summary
Sns originate in the thoracic and lumbar regions of the spinal cord short, synapsing with cell bodies of postganglionic neurons within ganglia that lie in a sympathetic ganglion chain located along either side of the spinal cord. Pns arise from the cranial and sacral areas of the cns longer than sympathetic preganglionic fibres because they do not end until they reach terminal ganglia that lie in or near the effector organs. Sns and pns preganglionic fibres release the same neurotransmitter, acetylcholine (ach), but the postganglionic endings of those two systems release different neurotransmitters. Pns release ach along with muscarinic fibres.
