MCDB 351 Lecture Notes - Lecture 20: Aorta, Peristalsis, Homeostasis
13 Dec 2016
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The business end of the sympathetic and parasympathetic nervous system (sns and psns) Some analogies to motor systems: alpha motor neurons (cholinergic) coming out of the spinal cord and innervating skeletal muscles, synapse on muscle to cause contraction. Autonomic nervous system: have control efferent neurons coming from the spinal cord and they are cholinergic (ach is the neurotransmitter: terminate on other neurons that are outside the central nervous system. Typically synapse on ganglia (clusters of neurons) These clusters of neurons will send input to different target structures: some cause smooth muscle to contract or relax, control activity of glands, control cardiac muscles. Both sns and psns neurons in the spinal cord are cholinergic. Cholinergic neurons synapsing on a norepinephrine neuron that releases. In all cases the pns the post ganglionic neurons are cholinergic: sns- cholinergic to norepinephrine (noradrenergic, psns-cholinergic to cholinergic. Psns on the right and sns on the left.
