Which choice correctly orders the connective tissue wrappings of a nerve, beginning at the outermost layer?
A. Perineurium epineurium endoneurium
B. Perineurium endoneurium epineurium
C. Epineurium perineurium endoneurium
D. Epineurium endoneurium perineurium
E. Endoneurium perineurium epineurium
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Question 2) A nerve
A. contains a single axon.
B. is found only in the CNS.
C. carries only sensory information.
D. carries information only toward the PNS.
E. is a cablelike bundle of parallel axons.
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Question 3) Following damage to axons nearby, oligodendrocytes
A. secrete growth factors.
B. do not secrete any chemicals.
C. secrete growth-inhibitory molecules.
D. grow their own fibers to occupy the space.
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Question 4) A neuropeptide is a molecule that is synthesized from an amino acid by the removal of a carboxyl group and the addition of another small functional group such as an amine group.
Indicate whether this statement is true or false.
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Question 5) Although severing a peripheral axon leads to some degeneration, the neurilemma remains largely intact.
Indicate whether this statement is true or false.
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Question 6) Wallerian degeneration involves the breakdown of
A. the segments of axon and myelin sheath between the site of damage and the peripheral effector.
B. the segments of axon and myelin sheath between the site of damage and the cell body.
C. the neurilemma both central and peripheral to the site of trauma.
D. macrophages and microglia that have completed the job of CNS cleanup after trauma.
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Question 7) With damage to nerve fibers, larger distances between the site of damage and the target structure innervated result in _________ chances of successful regeneration.
A. increased
B. decreased
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Question 8) Which division of the nervous system shows a greater capacity for regeneration?
A. CNS
B. PNS
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Question 9) Continuous conduction of a nerve impulse occurs only along
A. myelinated axons.
B. dendrites.
C. unmyelinated axons.
D. axons in the PNS.
E. axons in the CNS.
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Question 10) The function of myelin is to
A. block the transmission of a nerve impulse.
B. provide points of attachment for nerve threads.
C. produce faster nerve impulse propagation.
D. produce slow but continuous impulse conduction.
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