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The Autonomic Nervous System
ANS
21
Anatomy
Undergraduate 1
12/14/2011

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Term
The Autonomic Nervous System (ANS)
Definition
A motor nervous system that controls glands, cardiac muscle, and smooth muscle; Also known as visceral motor system; INVOLUNTARY
Term
Visceral reflexes
Definition
Unconscious, automatic, stereotyped responses to stimulation involving visceral receptors and effectors and somewhat slower responses
Term
Visceral reflex arc
Definition
Receptors-> Afferent neurons-> Interneurons-> Efferent neurons-> Effectors
Term
Autonomic tone
Definition
Normal background rate of activity that represents the balance of the two systems according to the body's changing needs
Term
Parasympathetic tone
Definition
Maintains smooth muscle tone in intestines
Term
Sympathetic tone
Definition
Keeps most blood vessels partially constricted and maintains blood pressure
Term
Autonomic pathway
Definition
Signal must travel across two neurons to get to the target organ. Must cross the synapse where these two neurons meet in an autonomic ganglion.
Term
Presynaptic neuron
Definition
The first neuron has a soma in the brainstem or spinal cord
Term
Postganglionic neuron
Definition
Axon extends the rest of the way to the target cell
Term
The Sympathetic Division
Definition
Also called thoraco-lumbar division; Relatively short preganglionic and long postganglionic fibers; Pre ganglionic neurosomas in lateral horns and nearby regions of the gray matter of spinal cord.
Term
Sympathetic chain of ganglia(Paravertebral ganglia)
Definition
Series of longitudinal ganglia adjacent to both sides of the vertebral column from cervical to coccygeal levels.
Term
Communicating rami
Definition
Two branches that connect each paravertebral ganglion to a spinal nerve
Term
White communicating ramus
Definition
Myelinated; Preganglionic fibers small myelinated fibers that travel from spinal nerve to the ganglion by way of this.
Term
Gray communicating ramus
Definition
Unmyelinated; Postganglionic fibers leave the ganglion by way of this; Forms a bridge back to the spinal nerve.
Term
Splanchnic nerves
Definition
Postganglionic fibers that pass through the sympathetic chain without synapsing
Term
Nerve fibers
Definition
Leave the sympathetic chain by spinal, sympathetic, and splanchnic nerves.
Term
Spinal nerve route
Definition
Postganglion fibers that exit a ganglion by way of the gray ramus; Return to the spinal nerve and travel the rest of the way to the target organ. BODY WALL ORGANS.
Term
Sympathetic nerve route
Definition
Nerves that leave by way of sympathetic nerves that extend to the heart, lungs, esophagus, and thoracic blood vessels (above diaphragm)
Term
Splanchnic nerve route
Definition
Fibers that arise from spinal nerves T5 to T12 pass through the sympathetic ganglia without synapsing, continue on as the splanchnic nerves, lead to second set of ganglia: collateral (prevertebral) ganglia and synapse there.
Term
Parasympathetic division
Definition
Also called craniosacral division; Arises from the brain and sacral regions of the spinal cord; Origin of long preganglionic neurons is midbrain, pons, and medulla.
Term
Pathways of long preganglionic fibers in the parasympathetic division
Definition
Fibers in cranial nerves III, VII, IX, and X.
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