Test_6_Notes

Test_6_Notes - 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  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  Parasympathetic Division - Preganglionic neurons in cranial III, VII, IX, and X and sacral spinal 
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This note was uploaded on 09/30/2011 for the course KIN 2500 taught by Professor Hargroder during the Fall '08 term at LSU.

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Test_6_Notes - Test 6 SNS - Covered this last test, now...

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