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  1. The ventral roots of each spinal segment
    control peripheral effectors and contain the axons of somatic motor and visceral motor neurons
  2. Spinal nerves are called mixed nerves because they
    contain sensory and motor fibers
  3. The adult spinal cord extends only to
    the first or second lumbar vertebra
  4. 3 facts of the gray matter of the spinal cord
    • It is located in the interior of the spinal cord around the central canal
    • It functions in processing neural information
    • It contains motor neurons
    • It is divided into regions called horns
  5. Proper sequence of reflex arch
    • 1) arrival of a stimulus and activation of a receptor
    • 2) activation of a sensory neurons
    • 3) information processing
    • 4) activation of a motor neuron
    • 5) response by an effector
  6. A sensory region monitored by the doral rami of a single spinal segment is
  7. The major nerve of the cervical plexus that innervates the diaphragm is
    phrenic nerve
  8. The genitofemoral, femoral, and lateral femoral cutaneous nerves are major nerves of the
    lumbar plexus
  9. The synapsing of several neuurons on the same postsynaptic neuron is called
  10. The feflexes that control the most rapid, stereotyped motor responses to stimuli are
    monosynaptic reflexes
  11. An example of a stretch reflex triggered by passive muscle movement is the
    patellar reflex
  12. The contraction of flexor muscles and the relaxation of extensor muscles illustrates the principle of
    reciprocal inhibition
  13. Reflex arcs in which the sensory stimulus and teh motor response occur on the same side of the body are
  14. Most superficial layer to deep
    • 1) walls of vertebral canal
    • 2) epidural space
    • 3) dura mater
    • 4) subdural space
    • 5) arachnoid membrane
    • 6) subarachnoid space
    • 7) pia mater
    • 8) spinal cord
  15. Explain the anatomical significance of the fact that spinal cord grown ceases at age 4
    The vertebral column continues to grow, extending beyond the cord. The end of the cord is visible as the conus medullaris near L1, and teh cauda equina extends the remainder of the column
  16. List, in sequence, the five steops involved in a neural reflex
    • 1) arrival of stimulus and activation of receptor
    • 2) activation of sensory neuron
    • 3) information processing
    • 4) activation of a motor neuron
    • 5) response by an effector (muscle or gland)
  17. Polysynaptic reflexes can produce far more complicated responses than can monosynaptic reflexes because
    the interneurons involved can control several muscle groups
  18. Why do cervical nerves outnumber cervical vertebrae
    The first cervical nerve exits superior to vertebra C1 (between the skull and vertebra); the last cervical nerve exits inferior to vertebra c7 (between the last cervical vertebra and the first thoracic vertebra). There are thus 8 cervical nerves but only 7 cervical vertebrae
  19. If the anterior gray horns of the spinal cord were damaged, what type of control would be affected?
    The cell bodies of spinal motor neurons are located in the anterior gray horns, so damage to these horns woudl result in a loss of motor control
  20. List all of the CNS sites were cerebrospinal fluid is located. What are the function of CSF?
    Within the CNS, CSF fills the central canal, the ventricles, and the subarachnoid space. CSF acts as a schock absorber and a diffusion medium for dissolved gases, nutrients, chemical messengers, and waste products.
  21. What 5 characteristics are common to all polysynaptic reflexes
    • 1) involvement of pools of interneurons
    • 2) intersegmental distribution
    • 3) involvement of reciprocal innervation
    • 4) motor response prolonged by reverberating circuits
    • 5) cooperation of reflexes to produce a coordinated, controlled response
  22. Predict the effects on the body of a spinal cord transection at C7. How would these effects differ from those of a spinal cord transection at T10
    Transection of the SC at C7 would most likely result in paralysis from the neck down. Transection at T10 would produce paralysis and eliminate sensory input in the lower half of the body only.
  23. The subarachnoid space contains
    cerebrospinal fluid
  24. Side-to-side movements of the spinal cord are prevented by the
    denticulate ligaments
  25. Ascending tracts
    carry sensory information to the brain
  26. What effect does the stimulation of a sensory neuron that innervates an intrafusal muscle fiber have on muscle tone?
    Stimulation of the sensory neuron will increase muscle tone
Card Set
AP 13 EOC 17354628 a
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