The Nervous System

The Nervous System - upper lumbar regions of the spinal...

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The Nervous System Spinal Nerves o The spinal nerves exit from the cervical, thoracic, lumbar, and sacral regions. o The nerves are grouped into plexuses. o The phrenic nerve, which supplies the diaphragm, is the most important branch of the cervical plexus. o The brachial plexus supplies nerves to the upper limb. o The lumbosacral plexus supplies nerves to the lower limb. Autonomic Nervous System The autonomic nervous system contains preganglionic and postganglionic neurons. The autonomic nervous system has sympathetic and parasympathetic divisions. Sympathetic Division o The sympathetic division is involved in preparing the person for action by increasing heart rate, blood pressure, and respiration rate. o Preganglionic cell bodies of the sympathetic division lie in the thoracic and
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Unformatted text preview: upper lumbar regions of the spinal cord. o Postganglionic cell bodies are located in the sympathetic chain ganglia or in collateral ganglia. Parasympathetic Division o The parasympathetic division is involved in vegetative activities, such as the digestion of food, defecation, and urination. o Preganglionic cell bodies of the parasympathetic division are associated with some of the cranial and sacral nerves. o Postganglionic cell bodies are located in terminal ganglia, located either near or within target organs. Autonomic Neurotransmitter Substances o All autonomic preganglionic and parasympathetic postganglionic neurons secrete acetylcholine. o Most sympathetic postganglionic neurons secrete norepinephrine....
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This note was uploaded on 12/04/2011 for the course ANTHRO 2000 taught by Professor Monicaoyola during the Fall '10 term at Broward College.

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