BLG 600 Lecture Notes - Lecture 3: Paravertebral Ganglia, Autonomic Nervous System, Prevertebral Ganglia

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9 Dec 2016
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Autonomic nervous system (ans) maintains homeostasis of the body by regulating many activities, including heart rate, breathing rate, body temperature, digestive processes, and urinary functions. Motor division consists of two parts: the somatic motor system, which regulates the activities of skeletal muscle and the ans, which regulates the activity of all the other effectors (smooth muscle, cardiac muscle, and glands) Ans effectors innervation of cardiac and smooth muscle. Ans efferent pathways: 2 neurons: preganglionic neuron cell body in brain or spinal cord synapses with postganglionic neuron, postganglionic neuron in the autonomic ganglion, where its neurons synapse with preganglionic. All spinal nerves receive postganglionic axons from a gray ramus communicans: sympathetic nerves to thoracic cavity (with synapse in chain) Postganglionic nerves target abdominopelvic organs: splanchnic nerves straight to adrenal gland (no synapse in chain) through chain and collateral ganglia without synapse.

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