Question 1

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 E)
G) A) and B)

Question 2

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) B) and E)
G) D) and E)

Question 3

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 C)
G) C) and D)

Question 4

A mixed nerve consists of both __________ and ___________.

Accepted Answer

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

Question 5

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) D) and E)

Question 6

The tendon reflex is the inhibition of a muscle's contraction that occurs when its tendon is excessively stretched.

Accepted Answer

A) True 
 B)False

Question 7

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) B) and C)

Question 8

The stretch reflex is the tendency of a muscle to stretch when it is overcontracted.

Accepted Answer

A) True 
 B)False

Question 9

Which of the following structures is the richest in lipid content?

Accepted Answer

A)  Gray matter
B)  White matter
C)  Arachnoid mater
D)  Dura mater
E)  Pia materF) A) and D)
G) C) and D)

Question 10

Cervical and lumbar enlargements are wide points in the spinal cord marking the emergence of motor nerves.

Accepted Answer

A) True 
 B)False

Question 11

Neurosomas of the anterior root are located in the __________.

Accepted Answer

A)  gray matter
B)  posterior root ganglion
C)  white matter
D)  anterior rootlets
E)  anterior root ganglionF) C) and D)
G) B) and C)

Question 12

A stretch reflex is often accompanied by reciprocal inhibition.

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) All of the above

Question 14

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

Question 15

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

Accepted Answer

A) True 
 B)False

Question 16

Voluntary motor signals typically begin in an upper motor neuron in the thalamus.

Accepted Answer

A) True 
 B)False

Question 17

Cerebrospinal fluid fills the space between the __________.

Accepted Answer

A)  dural sheath and dura mater
B)  dural sheath and vertebral bones
C)  dura mater and arachnoid mater
D)  arachnoid mater and pia mater
E)  dura mater and pia materF) A) and E)
G) A) and D)

Question 18

The upper motor neurons that control skeletal muscles begin with a soma 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 19

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) B) and D)
G) A) and B)

Question 20

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

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

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

A mixed nerve consists of both __________ and ___________.

Correct AnswerverifiedShow Answer

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

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

The tendon reflex is the inhibition of a muscle's contraction that occurs when its tendon is excessively stretched.

Correct AnswerverifiedShow Answer

Neurosomas of the anterior root are located in the __________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Cerebrospinal fluid fills the space between the __________.

Correct AnswerverifiedShow Answer

Voluntary motor signals typically begin in an upper motor neuron in the thalamus.

Correct AnswerverifiedShow Answer

Which of the following structures is the richest in lipid content?

Correct AnswerverifiedShow Answer

Cervical and lumbar enlargements are wide points in the spinal cord marking the emergence of motor nerves.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

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 AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The stretch reflex is the tendency of a muscle to stretch when it is overcontracted.

Correct AnswerverifiedShow Answer

A ganglion is a _________.

Correct AnswerverifiedShow Answer

A stretch reflex is often accompanied by reciprocal inhibition.

Correct AnswerverifiedShow Answer

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A mixed nerve consists of both and _.

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