10 PNS and ANS flashcards.doc

What are the neurons in the autonomic nervous system

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What are the neurons in the autonomic nervous system (ANS)? Visceral motor neurons 31. What tissues are innervated by the visceral motor neurons of the ANS? Motor neurons to smooth and cardiac muscles (the organs and blood vessels) 32. What is the function of the autonomic nervous system (ANS)? They are involved in digestion, blood flow, urination, defecation, glandular secretion. Therefore, the ANS supplies the glands, smooth muscle, and cardiac muscle, but NOT the skeletal muscle. 33. Do we have voluntary control over autonomic nerves? No 34. What is the ANS also called and why? the general visceral motor system (be/c it supplies the glands, smooth muscle, and cardiac muscle, but NOT the skeletal muscle). 35. Does the ANS have sensory neurons, interneurons, or motor neurons? The ANS has motor neurons only (there are no sensory neurons in the ANS). 36. How do the ANS motor neurons differ from the somatic nervous system motor neurons? there are two lower motor neurons in the periphery of the ANS and one lower motor neuron in the SNS.
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PNS and ANS Flashcards 37. What is the structure where the two ANS nerves come together? the AUTONOMIC GANGLIA 38. What is the proximal ANS neuron called? 39. What is the distal ANS neuron called? The first nerve is the PRE-GANGLIONIC NEURON. The second nerve is the POST-GANGLIONIC NEURON. 40. Where are the cell bodies of the proximal neuron located? **remember these are motor nerves, so the cell bodies of the pre-ganglionic neurons are located in the anterior horn of the grey matter in the spinal cord 41. Characteristics of the ANS motor unit: a. How many motor neurons? b. Are the axons myelinated or not? c. Is conduction slow or fast? d. Are the axons thick or thin? Has more than one lower motor neuron, the axons may be myelinated or unmyelinated, conduction is slow, the axons are thin. 42. SYMPATHETIC DIVISION does what to the following?
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  • Fall '08
  • Harrison,C
  • Median nerve

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