Nervous System

  1. What type of neuroglia are found in the CNS?
    • Oligodendrocyte
    • Astrocyte
    • Ependymal cell
    • Microglia
  2. What is the most abundant neuroglia found in the CNS?
  3. What is the function of astrocytes
    Feed neuron and BBB
  4. What type of neuroglia are found in the PNS?
    • Schwann cells
    • Satellite cells
  5. _____ form myelin sheath in the CNS and insulate axons
  6. _____ form myelin sheath in the PNS
    Schwann cells
  7. What is the characteristic of ependymal cells?
    Cuboidal epithelium with cilia on apical surface
  8. What is the function of ependymal cell?
    Secrete CSF in CNS
  9. What is the small wondering macrophage in the CNS called?
  10. What is the function of satellite cells and where is it found?
    • Found in the PNS and act like astrocytes in the CNS just not responsible for BBB
    • Provide electrical insulation around the soma
    • Regulate chemical environment of the neurons
  11. True/False glia are like neurons and rarely enter cancerous state.
    FALSE. Glia can become tumors because they ARE mitotically active, unlike neurons.
  12. What is the most common type of brain tumor called?
    Gliomas. These grow rapidly and are highly malignant
  13. What makes gliomas complicated to treat?
    BBB decreases effectiveness of chemotherapy
  14. _____ neurons transmit information towards the CNS
    Afferent (sensory)
  15. ___ receive signals from many neuron and integrate information
    Interneurons (association)
  16. ____ send signals away from the CNS
    Efferent (motor)
  17. Majority of neurons are this type of neuron
  18. Parts of the neuron
    Dendrites (input), Axon (output), Axon hillock (polling station/trigger zone), Soma
  19. True/False. The cell body of the neuron does not contribute to action potential generation.
    True. It is only important in making ATP and creates the biochemistry responsible for cellular function.
  20. What is the most common type of neuron branching connection?
    Multipolar, having many dendrites to receive information (and “vote”). But only one axon
  21. How can you tell a dendrite from axon?
    If it has receptors for neurotransmitters, then it is dendritic. If not, it is an axon
  22. True/False. There are neurons that have more than one axon
    False. There can be only one axon
  23. ____ neuron has its axon hillock right at the dendrites, and immediately send the signal down to release neurotransmitter at the axon terminals
  24. Where are unipolar neurons commonly found?
    Sensory parts of the body such as finger tips
  25. Why is the reason that unipolar neuron’s cell boy is far away from the dendrites?
    Because it is for sensory, soma is somewhere else being protected.
  26. True/False. There exists a type of neuron without any axons.
    True. They are called anaxonic, and that is all we need to know.
  27. Where do the dendrites send their signals to create an action potential?
    The dendrite integrate signals at the axon hillock, and “vote” to see whether to generate an action potential
  28. Where are graded potentials seen, and where are action potentials seen?
    Graded- seen in dendrites, like ripples. Action potential – down the axons
  29. What is the reason that action potential only fires in one direction?
    The refractory membrane that immediately follows the action potential that is in progress.
  30. What are the locations of synapse formation?
    Axodendritic, axosomatic, and axoaxonic (inhibitory synapse)
  31. What are the factors that determines how fast a nerve signal travels along the nerve fiber?
    • Diameter of the fiber – larger fibers have more SA and conduct signals more rapidly
    • Presence or absence of myelin
  32. What is the covering directly over the myelin sheath on the axon called?
  33. What is the covering that wraps around the entire myelinated axon called?
  34. What is the difference between myelination in the CNS and PNS?
    Oligodendrocytes in the CNS act on small portion of MANY axons (arm-like process). Schwann cells of the PNS act on one portion of a SINGLE axon
  35. How is summation generated?
    Threshold voltage is achieved by multiple excitations (ripple building)
  36. What is involved in a reflex arc?
    Sensory to CNS, specifically interneuron which is confined to the CNS, to motor
  37. The nervous system is divided into ______ and ____ divisions
    CNS and PNS
  38. Cranial nerves belong to ______ nervous system.
  39. The PNS is subdivided into _____ and ______.
    Motor and visceral (sensory)
  40. Autonomic nervous system is part of the _____ functional division
    Motor  Visceral motor (which is autonomic)
  41. True/False. Enteric Nervous system arise from the brainstem and spinal cord (CNS)
    FALSE. Enteric nervous system is its own system, has influence by visceral motor (autonomic), but has no components in CNS.
  42. What is the difference between visceral and somatic motor activity?
    Somatic motor is voluntary (skeletal muscle). Visceral motor is not (smooth muscle contraction).
  43. _____is released by the preganglionic neuron at the postganglionic neuron in both parasympathetic and sympathetic nervous system
  44. Preganglionic neuron of the parasympathetic nervous system is ______.
  45. Preganglionic neuron of the sympathetic nervous system is _____.
  46. Postganglionic neuron of the sympathetic nervous system releases _____ and/or ____.
    Acetylcholine, norepinephrine
  47. Sympathetic spinal nerves come out of _______ and _____ regions of the spinal cord.
    Thoracic, lumbar. (THORACOLUMBAR)
  48. Parasmpathetic spinal nerves come out of ______ and the ____ region of the spinal cord.
    Carnium, sacrum. (Cranio-sacral)
  49. What exits the cervical plexus?
    Neither sympathetic nor parasympathetic. Phrenic nerve exits there, C3, C4, C5 keeps you alive.
  50. Which system are the cranial nerves a part of?
    PNS. With the EXCEPTION of CN II- Optic Nerve.
  51. Where do cranial nerve ganglia originate in?
  52. True/False. Only parasympathetic nerves are found in cranio cavity.
  53. Further subdivision of the autonomic nervous system is ________ and _______.
    Parasympathetic, sympathetic nervous system.
  54. What is the mechanism behind a blown pupil after a head injury?
    Because the brain is swelling, it compresses on the parasympathetic nerve, and it is no longer able to constrict the pupil. Sympathetic nerves do not stem from the brain itself, so it is still functioning, it will dilate the eye via. T1 nerve.
Card Set
Nervous System
Nervous System Overview. HnH