KIN 2500 Test 6

KIN 2500 Test 6 - Test 6 SNS Covered this last test now...

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Test 6 SNS - Covered this last test, now talking about the ANS - One motor neuron to the effectors ANS - Contains 2 motor neurons in the path, known as preganglionic neuron and postganglionic neuron o Preganglionic neuron- from CNS to autonomic ganglia Cell body in the lateral gray horn Axon runs to the autonomic ganglia o Postganglionic neuron- from the autonomic ganglia to the effector Cell body in the autonomic ganglia Axon runs to the effector - All of the pathways are motor- NO SENSORY pathways in the ANS o Sensory information provided through the SNS - Autonomic ganglia o Sympathetic division Sympathetic chain (vertebral chain, paravertebral) Lie on the side of the cord Prevertebral Lie anterior to the cord, in the ventral body cavity o Parasympathetic division Terminal Located close to and even perhaps on the effector Sympathetic Division
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- Preganglionic neurons arise in the lateral gray horns of the thoracic and lumbar spinal cord segments (T1-L2) o Thoracolumbar outflow - Rami Communicantes o White ramus- preganglionic axon into the chain Preganglionics are generally short o Gray ramus- postganglionic axon out of the chain Postganglionics are generally long - Superior cervical ganglia o Innervates the head - Middle cervical ganglia o Innervates the heart - Inferior cervical ganglia o Innervates the heart - Thoracic Portion o Heart, lungs, bronchi, middle and upper abdominal viscera - Lumbar Portion o Lower pelvic viscera - Splanchnic nerves- pass through the chain without synapsing and run to the Prevertebral ganglia (other type of sympathetic pathway) - Prevertebral ganglia (labeling) o Celiac g o Aoriticorenal g o Renal g o Superior mesenteric g o Inferior mesenteric g
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- Greater Splanchnic- pass through the chain AND the Prevertebral ganglia and go all the way to the effector as a pregangliac neuron o The greater splanchnic nerve enters the celiac ganglion and continues to the adrenal gland as a preganglionic neuron - General physiologic effects = fight or flight o Increase the activity of the organs - 3 structural variations o Immediate synapse Takes white ramus to the chain, synapses immediately with the cell body of a postganglionic, post takes the gray ramus and takes the same spinal nerve that the pre came from o Delayed synapse White ramus brings pre in, the message then moves up or down the chain before synapsing with a post, post then carries impulse through the gray ramus through the spinal nerve that is different from the one the pre entered o Prevertebral/ splanchnic nerve Preganglionic enters the chain, may pass through immediately or travel up and down but exits remaining a preg and proceeds to the Prevertebral Parasympathetic Division - Preganglionic neurons in cranial III, VII, IX, and X and sacral spinal segments o Craniosacral outflow - CN X produces 80% of parasympathetic impulses o Goes to the ganglia that lie on the effectors - Sacral portion innervates pelvic viscera - General physiologic effects = rest and digest - Terminal Ganglia o Cillary g CN III- eyes
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KIN 2500 Test 6 - Test 6 SNS Covered this last test now...

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