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Autonomic Nervous System

Autonomic Nervous System - Autonomic Nervous System...

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11/14/2011 1 Autonomic Nervous System Learning Outcomes: Be able to: • Describe the anatomy of the sympathetic and parasympathetic nervous system i l di i i f li i li d f including origin of preganglionic neurons, ganglia, and target organs for postganglionic neurons • Describe innervation and function of the adrenal medulla • Compare and contrast the autonomic and somatic motor divisions • Describe transmitters and receptors for the ANS • List parasympathetic effects • List sympathetic effects • Describe the fight / flight response • Compare and contrast the parasympathetic and sympathetic nervous systems 16-1 Characteristics of ANS • Visceral motor neurons Visceral motor neurons Target organs: – Cardiac muscle – Smooth muscle – Glands – Adipocytes
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11/14/2011 2 Compare somatic / visceral motor neurons: In ANS, not ONE but rather TWO motor neurons, which synapse in outlying ganglion Preganglionic neuron originates in CNS Postganglionic neuron originates in ganglion Compare somatic / visceral motor neurons: 16-4
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11/14/2011 3 Two Divisions of ANS • Sympathetic “fight/flight” fight/flight • Parasympathetic “rest/digest” Almost every target organ: Smooth muscle Cardiac muscle • Glands Receives dual innervation from both divisions Sympathetic Division Origin: Preganglionic cell bodies spinal cord segments T1-L2 Most preganglionic axons synapse in sympathetic chain ganglia Some synapse “further out” in collateral ganglia A few go straight POST- 16-6 A few go straight to adrenal gland
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11/14/2011 4 Collateral ganglia surround aorta aorta Sympathetic = “Thoracolumbar Division 16-8
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