Question 1

The upper motor neurons that control skeletal muscles begin with a neurosoma in the __________.

Accepted Answer

A)   posterior horn of the spinal cord
B)   anterior horn of the spinal cord
C)   motor association cortex of the cerebrum
D)   postcentral gyrus of the cerebrum
E)   precentral gyrus of the cerebrumF) A) and B)
G) A) and C)

Question 2

A ganglion is a swelling along a nerve containing the cell bodies of peripheral neurons.

Accepted Answer

A) True 
 B)False

Question 3

Second-order neurons synapse with third-order neurons in the __________.

Accepted Answer

A)   thalamus
B)   dorsal root ganglion
C)   spinal cord
D)   cerebral cortex
E)   medulla oblongataF) A) and E)
G) C) and D)

Question 4

There are __________ pairs of spinal nerves.

Accepted Answer

A)   12
B)   24
C)   31
D)   35
E)   62F) A) and C)
G) C) and E)

Question 5

Which of the following is not a function associated with the spinal cord?

Accepted Answer

A)   Protect neurons in both the ascending and descending tracts
B)   Mediate a reflex,such as the withdrawal of a hand from pain
C)   Conduct sensory information up to the brain
D)   Conduct motor information down the cord
E)   Coordinate the alternating contraction of several muscle groups associated with locomotionF) A) and E)
G) A) and C)

Question 6

If a bee sting on the right thigh causes a quick involuntary reaction of the right arm,this would be an example of a(n) __________ reflex.

Accepted Answer

A)   bilateral
B)   intersegmental
C)   withdrawal
D)   crossed extensor
E)   contralateralF) None of the above
G) C) and E) B

Question 7

A __________ is a cordlike organ composed of numerous __________.

Accepted Answer

A)   nerve fiber;nerves
B)   nerve fiber;axons
C)   nerve;axons
D)   nerve fiber;neurosomas
E)   nerve;neurosomasF) C) and E)
G) A) and B)

Question 8

The flexor (withdrawal) reflex employs a ___________,which maintains a sustained contraction.

Accepted Answer

A)   parallel after-discharge circuit
B)   diverging circuit
C)   converging circuit
D)   closed circuit
E)   reverberating circuitF) B) and E)
G) C) and D)

Question 9

Which of the following is comprised of anterior rami from C5-T1?

Accepted Answer

A)   Cervical plexus
B)   Brachial plexus
C)   Coccygeal plexus
D)   Sacral plexus
E)   Lumbar plexusF) B) and E)
G) A) and B)

Question 10

Somatic reflexes are responses of skeletal,smooth,and cardiac muscles.

Accepted Answer

A) True 
 B)False

Question 11

Which of the following fractures would be the least likely to cause a spinal cord injury?

Accepted Answer

A)   A fracture of vertebra C2
B)   A fracture of vertebra C6
C)   A fracture of vertebra T5
D)   A fracture of vertebra T12
E)   A fracture of vertebra L4F) B) and D)
G) None of the above E

Question 12

A dermatome is a nerve innervating a specific region in the skin.

Accepted Answer

A) True 
 B)False

Question 13

A patient with no sensation in the left thumb would most likley have nerve damage of the __________ spinal nerve.

Accepted Answer

A)   T1
B)   T5
C)   C5
D)   C6
E)   L3F) A) and D)
G) A) and C)

Question 14

A ganglion is a _________.

Accepted Answer

A)   bundle of axons in the CNS
B)   cluster of dendrites in either the CNS or the PNS
C)   cluster of neurosomas in the PNS
D)   bundle of axons in the PNS
E)   cluster of neurosomas in the CNSF) A) and D)
G) A) and E) C

Question 15

Voluntary motor impulses leave the spinal cord via the _________ of gray matter.

Accepted Answer

A)   anterior horn
B)   posterior horn
C)   anterior column
D)   posterior column
E)   lateral hornF) A) and B)
G) A) and C)

Question 16

Which of the following is contained within gray matter?

Accepted Answer

A)   Glial cells,axons of motor neurons,and Schwann cells
B)   Glial cells and myelinated fibers
C)   Neurosomas,dendrites,and proximal parts of axons of neurons
D)   The distal part of axons of lower order motor neurons
E)   Glial cells onlyF) A) and E)
G) B) and D)

Question 17

A nerve fiber is enclosed in its own fibrous sleeve called perineurium.

Accepted Answer

A) True 
 B)False

Question 18

The middle layer of the meninges is called the __________.

Accepted Answer

A)   gray matter
B)   white matter
C)   dura mater
D)   arachnoid mater
E)   pia materF) C) and D)
G) B) and C)

Question 19

Which of the following sensory functions involves neurons in the posterior root ganglion?

Accepted Answer

A)   Smell
B)   Hearing
C)   Touch
D)   Taste
E)   VisionF) A) and E)
G) A) and D)

Question 20

A reflex in which the sensory input and motor output are on opposite sides of the spinal cord,is called a(n) _________ reflex arc.

Accepted Answer

A)   intersegmental
B)   contralateral
C)   ipsilateral
D)   polysynaptic
E)   monosynapticF) A) and B)
G) None of the above

Exam 13: The Spinal Cord,spinal Nerves,and Somatic Reflexes

The upper motor neurons that control skeletal muscles begin with a neurosoma in the __________.

Correct AnswerverifiedShow Answer

A ganglion is a swelling along a nerve containing the cell bodies of peripheral neurons.

Correct AnswerverifiedShow Answer

Second-order neurons synapse with third-order neurons in the __________.

Correct AnswerverifiedShow Answer

There are __________ pairs of spinal nerves.

Correct AnswerverifiedShow Answer

Which of the following is not a function associated with the spinal cord?

Correct AnswerverifiedShow Answer

If a bee sting on the right thigh causes a quick involuntary reaction of the right arm,this would be an example of a(n) __________ reflex.

Correct AnswerverifiedB

A __________ is a cordlike organ composed of numerous __________.

Correct AnswerverifiedShow Answer

The flexor (withdrawal) reflex employs a ___________,which maintains a sustained contraction.

Correct AnswerverifiedShow Answer

Which of the following is comprised of anterior rami from C5-T1?

Correct AnswerverifiedShow Answer

Somatic reflexes are responses of skeletal,smooth,and cardiac muscles.

Correct AnswerverifiedShow Answer

Which of the following fractures would be the least likely to cause a spinal cord injury?

Correct AnswerverifiedE

A dermatome is a nerve innervating a specific region in the skin.

Correct AnswerverifiedShow Answer

A patient with no sensation in the left thumb would most likley have nerve damage of the __________ spinal nerve.

Correct AnswerverifiedShow Answer

A ganglion is a _________.

Correct AnswerverifiedC

Voluntary motor impulses leave the spinal cord via the _________ of gray matter.

Correct AnswerverifiedShow Answer

Which of the following is contained within gray matter?

Correct AnswerverifiedShow Answer

A nerve fiber is enclosed in its own fibrous sleeve called perineurium.

Correct AnswerverifiedShow Answer

The middle layer of the meninges is called the __________.

Correct AnswerverifiedShow Answer

Which of the following sensory functions involves neurons in the posterior root ganglion?

Correct AnswerverifiedShow Answer

A reflex in which the sensory input and motor output are on opposite sides of the spinal cord,is called a(n) _________ reflex arc.

Correct AnswerverifiedShow Answer

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B

A is a cordlike organ composed of numerous .

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E

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C

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