Question 1

The spinal cord is divided into all of the following regions except

Accepted Answer

A)  cervical.
B)  thoracic.
C)  lumbar.
D)  pelvic.
E)  sacral.F) A) and B)
G) A) and C)

Question 2

Which of the following branches of a spinal nerve have somas of solely sensory neurons?

Accepted Answer

A)  posterior (dorsal)  root
B)  anterior (ventral)  root
C)  posterior ramus
D)  anterior ramus
E)  meningeal branchF) B) and E)
G) A) and C)

Question 3

The fibers that carry action potentials to cause skeletal muscle to contract are

Accepted Answer

A)  gamma motor neurons.
B)  anulospiral endings.
C)  intrafusal fibers.
D)  extrafusal fibers.
E)  alpha motor neurons.F) A) and D)
G) C) and D)

Question 4

keep(s)  nerve fibers insulated from one another.

Accepted Answer

A)  Perineurium
B)  Endoneurium
C)  Fascicles
D)  Epineurium
E)  Blood vesselsF) B) and E)
G) A) and B)

Question 5

Posterior root ganglia contain somas of unipolar neurons.

Accepted Answer

A) True 
 B)False

Question 6

Most nerves are motor nerves.

Accepted Answer

A) True 
 B)False

Question 7

Which of the following groups of muscles have the most muscle spindles?

Accepted Answer

A)  muscles of the hand
B)  muscles of the back
C)  muscles of the thigh
D)  muscles of the middle-ear
E)  muscles of the torsoF) B) and D)
G) D) and E)

Question 8

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

Accepted Answer

A) True 
 B)False

Question 9

This figure shows a dermatome map.A patient with no sensation in the left thumb would probably have a nerve damaged in

Accepted Answer

A)  T1.
B)  T5.
C)  C5.
D)  C6.
E)  L3.F) A) and C)
G) B) and C)

Question 10

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) All of the above
G) C) and D)

Question 11

This figure shows a detail of the spinal cord, meninges, and spinal nerves.What does "4" represent?

Accepted Answer

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

Question 12

The cross extension reflex is the contraction of the extensors on one side of the body when the flexors
are contracted on the other side.

Accepted Answer

A) True 
 B)False

Question 13

fibers innervate eyes and ears.

Accepted Answer

A)  White
B)  Visceral
C)  Somatic
D)  Special
E)  GeneralF) A) and E)
G) None of the above

Question 14

The spinal cord conducts signals up and down the body passing through gray and white matter, respectively.

Accepted Answer

A) True 
 B)False

Question 15

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

Accepted Answer

A) True 
 B)False

Question 16

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) A) and E)
G) A) and D)

Question 17

A reflex where 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) None of the above
G) B) and D)

Question 18

A mixed nerve consists of both

Accepted Answer

A)  myelinated and unmyelinated fibers.
B)  glial cells and nerve cells.
C)  afferent and efferent fibers.
D)  association and integration neurons.
E)  spinal and cranial fibers.F) A) and E)
G) C) and E)

Question 19

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) A) and C)
G) D) and E)

Question 20

Which of the following nerves originates in the lumbosacral plexus?

Accepted Answer

A)  axillary
B)  sciatic
C)  phrenic
D)  ilioinguinal
E)  obturatorF) C) and E)
G) A) and E)

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

Posterior root ganglia contain somas of unipolar neurons.

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The spinal cord is divided into all of the following regions except

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The fibers that carry action potentials to cause skeletal muscle to contract are

Correct AnswerverifiedShow Answer

A is a cordlike organ composed of numerous .

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Which of the following branches of a spinal nerve have somas of solely sensory neurons?

Correct AnswerverifiedShow Answer

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

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Which of the following nerves originates in the lumbosacral plexus?

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This figure shows a dermatome map.A patient with no sensation in the left thumb would probably have a nerve damaged in

Correct AnswerverifiedShow Answer

The cross extension reflex is the contraction of the extensors on one side of the body when the flexors are contracted on the other side.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

This figure shows a detail of the spinal cord, meninges, and spinal nerves.What does "4" represent?

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Most nerves are motor nerves.

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Which of the following groups of muscles have the most muscle spindles?

Correct AnswerverifiedShow Answer

The spinal cord conducts signals up and down the body passing through gray and white matter, respectively.

Correct AnswerverifiedShow Answer

fibers innervate eyes and ears.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

keep(s) nerve fibers insulated from one another.

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A mixed nerve consists of both

Correct AnswerverifiedShow Answer

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