EDKP 292 Lecture Notes - Lecture 40: Autonomic Nervous System, Arachnoid Granulation, Cerebrospinal Fluid
11 Dec 2017
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The para and sympathetic systems are not always one or the other one. Usually they are both on at the same time. There effects on the same organ are always opposites so for the heart, one system will slow it down while the other will speed it up. Enteric system pretty much just controls the digestive tract. Sympathetic is going to govern the flight or fight responses. They release acetylcholine which bind to nicotinic acetylcholine receptors. The post ganglionic neurons, which have a long axon, release norepinephrine which binds to adrenergic receptors. They originate in the brain stem and the sacral spinal cord. They will release acetylcholine which binds to the nicotinic acetylcholine receptors. Then the short post ganglionic neuron will have a short axon and releases acetylcholine which will bind to muscarinic acetylcholine receptors. Most sensory information will enter the brain through the vagus x nerve.
