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31 Cards in this Set
- Front
- Back
Visceral efferent fibers
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motor fibers, innervate involuntary (smooth) muscle, in the walls of organs and blood vessels, modified cardiac muscle, glands
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Visceral afferent fibers
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provide information about bodys internal environment, regulate BP and blood chemistry by altering heart rate, respiratory rate, vascular resistance, also pain
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Name two divisions of autonomic system
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Sympathetic (thoracolumbar) and Parasympathetic (craniosacral)
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Where is the cell body of preganglionic neuron located?
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Gray matter of CNS
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Where do preganglionic fibers terminate
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On postganglionic neuron
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Where are the cell bodies of postganglionic neuron located?
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Autonomic ganglia outside CNS
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Where do postsynaptic fibers terminate?
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On effector organ (smooth muscle, cardiac muscle, glands)
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Which NT is used by sympathetic system?
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NE (except sweat glands)
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Which NT is used by parasympathetic system
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Ach
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Name two roots of spinal nerve
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Ventral - efferent
Dorsal-afferent |
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Name two branches of spinal nerve
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Ventral and dorsal rami, carry both motor and sensory fibers
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What does dorsal ramus innervate
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Synovial joints of the vertebral column, deep muscles of the back, overlying skin
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What does ventral ramus innervate
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Anterior and lateral regions of the trunk, upper and lower limbs
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GSA fibers
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General somatic afferent, transmit sensations from body to CNS - pain, touch, temp, proprioceptive info from muscles, tendons, joints.
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Dermatome
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Unilateral area of skin innervated by general sensory fibers of a single spinal nerve
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Why doesnt lesion of single spinal nerve result in paralysis
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General sensory fibers conveyed by adjacent spinal nerves overlap almost completely as they are distribute to skin, providing double coverage
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GSE
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General somatic efferent, transmit impulses to skeletal muscles
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Myotome
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Unilateral muscle mass receiving innervation from the somatic motor fibers conveyed by single spinal nerve
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GVA
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General visceral afferent, transmit pain or subconscious visceral reflex sensations from hollow organs, glands and blood vessels to CNS
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Name location of cell bodies of sensory fibers
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Both visceral and general sensory fibers have their cell bodies in spinal ganglia or ganglia of cranial nerves
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GVE
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transmit impulses to involuntary muscle and glandular tissue
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IML
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Lateral horns, location of preganglionic neurons of sympathetic division of ANS, located between T1-L2 segments of spinal cord
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Name location of sympathetic postganglionic cell bodies
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Paravertebral ganglia - form sympathetic chains on each side of vertebral column
Prevertebral ganglia - plexuses surrounding origins of abdominal aorta |
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How do axons of preganglionic neurons leave spinal cord
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Through ventral roots and enter ventral rami of spinal nerves T1-L2, then pass to sympathetic chain through white rami communicantes (WRC)
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What are 4 possible courses preganglionic fibers can take within sympathetic chain
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1) ascend
2)descend and synapse there 3)synapse at same level it was 4) not synapse at all, and continue through splanchnic nerve to reach prevertebral ganglia |
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Which preganglionic nerves would follow first three routes
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Nerves that innervate head, neck, body wall, limbs and thoracic cavity
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Which pregnaglionic nerves would follow last route?
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Nerves innervating viscera of abdominopelvic region
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How do postganglionic fibers travel
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They pass from paravertebral ganglia of sympathetic chains to adjacent ventral rami of spinal nerves through grey rami communicantes
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Which spinal nerves get postganglionic fibers
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All 31
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Splanchnic nerve
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Convey visceral efferent and aferent fibers to and from viscera of the body cavities
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Name location of preganglionic parasympathetic cell bodies
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CN III, VII, IX, X
S2-S4 segments of spinal cord |