Term
| The Autonomic Nervous System (ANS) |
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Definition
| A motor nervous system that controls glands, cardiac muscle, and smooth muscle; Also known as visceral motor system; INVOLUNTARY |
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Term
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Definition
| Unconscious, automatic, stereotyped responses to stimulation involving visceral receptors and effectors and somewhat slower responses |
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Term
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Definition
| Receptors-> Afferent neurons-> Interneurons-> Efferent neurons-> Effectors |
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Term
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Definition
| Normal background rate of activity that represents the balance of the two systems according to the body's changing needs |
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Definition
| Maintains smooth muscle tone in intestines |
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Definition
| Keeps most blood vessels partially constricted and maintains blood pressure |
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Term
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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. |
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Term
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Definition
| The first neuron has a soma in the brainstem or spinal cord |
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Term
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Definition
| Axon extends the rest of the way to the target cell |
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Term
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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. |
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Term
| Sympathetic chain of ganglia(Paravertebral ganglia) |
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Definition
| Series of longitudinal ganglia adjacent to both sides of the vertebral column from cervical to coccygeal levels. |
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Term
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Definition
| Two branches that connect each paravertebral ganglion to a spinal nerve |
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Term
| White communicating ramus |
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Definition
| Myelinated; Preganglionic fibers small myelinated fibers that travel from spinal nerve to the ganglion by way of this. |
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Term
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Definition
| Unmyelinated; Postganglionic fibers leave the ganglion by way of this; Forms a bridge back to the spinal nerve. |
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Term
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Definition
| Postganglionic fibers that pass through the sympathetic chain without synapsing |
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Term
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Definition
| Leave the sympathetic chain by spinal, sympathetic, and splanchnic nerves. |
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Term
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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. |
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Term
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Definition
| Nerves that leave by way of sympathetic nerves that extend to the heart, lungs, esophagus, and thoracic blood vessels (above diaphragm) |
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Term
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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. |
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Term
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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. |
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Term
| Pathways of long preganglionic fibers in the parasympathetic division |
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Definition
| Fibers in cranial nerves III, VII, IX, and X. |
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