UGA CBIO 2200 - Enteric Nervous System (4 pages)

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Enteric Nervous System

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Enteric Nervous System


Intro to enteric nervous system, visceral reflexes

Lecture number:
Lecture Note
University of Georgia
Cbio 2200 - Anat & Physiol I

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CBIO 2200 1nd Edition Lecture 21 Outline of Last Lecture I Dermatomes and Cutaneous Innervation II Diseases III Reflexes IV Spinal Cord Trauma Outline of Current Lecture I Visceral Reflexes II Functional Organization III The Enteric Nervous System IV Neurotransmitters and Their Receptors Current Lecture Chapter 15 The Autonomic Nervous System and Visceral Reflexes I Visceral Reflexes a The ANS is responsible for the body s visceral reflexes e g heart rate blood pressure body temp b Visceral reflex arc i Receptors ii Afferent neurons iii Interneurons iv Efferent neurons v Effectors c Baro reflex i High blood pressure detected by arterial stretch receptors baroreceptors 1 Receptors are right at the aorta where blood is pumped from the heart 2 Sent to CNS to interpret These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute II a Too high slow down heart rate vasodilation b Too low raise heart rate vasoconstriction ii Example of homeostatic negative feedback loop d Autonomic Motor Pathways vs Somatic Motor Pathways i ANS two neurons from CNS to effectors 1 Myelinated preganglionic fiber will synapse onto ganglion which gives rise to a un myelinated postganglionic fiber Functional Organization a Somatic voluntary autonomic involuntary b Sympathetic division i Prepares for physical activity ii Fight or flight division stressful situations iii The thoracolumbar division name comes from where the nerves arrive from thoracic and lumbar regions of the spinal cord iv Short preganglionic and long postganglionic fibers gives rise to the sympathetic ganglion chain v Preganglionic neurosomas 1 Lead to nearby sympathetic chain of ganglia aka paravertebral ganglia vi White communicating ramus myelinated 1 Splanchnic nerves innervate internal organs vii Gray communicating ramus unmyelinated viii Neural divergence not 1 to 1 relationship of post and preganglionic fibers 1 One preganglionic

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