8A Nerve flashcards.doc

Multiple sclerosis 41 what are the two differences

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MULTIPLE SCLEROSIS 41. What are the two differences between SCHWANN CELLS and OLIGODENDRICYTES? Schwann cells are in PNS and each cell only forms one myelin sheath. Oligodendricytes are in CNS and each cell can form more than one myelin sheaths. 42. What are the 3 functions of an ASTROCYTE? a. Physically supports the neurons b. Transmits materials from capillaries to neurons c. Forms blood-brain barrier (BBB), which keeps out harmful substances and many medicines 43. What is the only function of the blood-brain barrier BBB? The only function of the blood-brain barrier is to help protect the central nervous system. 44. DDefine MICROGLIA and their function They are macrophages 4
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Nerve Cell Flashcards They pick up bacteria and debris 41. What are ependymal cells? Cells that line the ventricles of the brain and produce cerebral spinal fluid (CSF) 42. What is the portion of the CNS that is unmyelinated (cell bodies of neurons, glia, and dendrites)? GREY MATTER 45. What is the portion of the CNS with myelin WHITE MATTER 46. What is a collection of axons in the PNS? NERVE; No cell bodies, dendrites, or synapses; just axons. 47. What is a collection of axons in the CNS TRACT 48. Where is most information processed? SYNAPSES in the CNS 49. What is a collection of cell bodies in the PNS? Ganglion 50. What is a network of nerves called? NERVE PLEXUS 51. What are the neurons that leave the CNS to effect a muscle or gland? MOTOR NEURONS 52. What neurons go from body to CNS, carrying sensory information? SENSORY NEURON 53. What is a small neuron found only in the CNS? INTERNEURON 54. What is the function of interneuron? it connects two other neurons in the spinal cord 55. What makes the CNS complex? The large number of interneurons in the CNS 56. Where are the cell bodies of motor neurons and interneurons located? In gray matter 57. Gray matter in the CNS contains what structures? Neuroglia, neuron cell bodies, dendrites. Everything except myelinated neurons 58. For a substance to diffuse across a semipermiable membrane, what two conditions must be met? a) The membrane must be permeable to the substance b) The substance must have a concentration gradient 59. At resting membrane potential, is the inside of the cell membrane positive or negative? What about the outside of the cell membrane? Inside is negative, outside is positive 60. What makes the inside of a cell membrane negatively charged? Proteins inside the cell make it negative 61. What changes the overall charge on the inside and outside of the cell membrane?
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  • Fall '08
  • Harrison,C
  • Schwann Cells

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