Question 1

This figure shows the posterior aspect of spinal nerve roots and plexuses.What does "3" represent?

Accepted Answer

A)  cervical plexus
B)  brachial plexus
C)  coccygeal plexus
D)  sacral plexus
E)  lumbar plexusF) B) and C)
G) None of the above

Question 2

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

Accepted Answer

A) True 
 B)False

Question 3

Nerve fibers in a given tract in the white matter are similar in origin, destination, and function.

Accepted Answer

A) True 
 B)False

Question 4

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

Accepted Answer

A) True 
 B)False

Question 5

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

Accepted Answer

A) True 
 B)False

Question 6

Each portion of the spinal cord served by a spinal nerve is called a segment of the cord.

Accepted Answer

A) True 
 B)False

Question 7

This figure shows the anatomy of a nerve.What does "3" represent?

Accepted Answer

A)  nerve fiber
B)  spinal nerve
C)  epineurium
D)  endoneurium
E)  perineuriumF) None of the above
G) D) and E)

Question 8

Which of these is an ascending tract of the spinal cord?

Accepted Answer

A)  the lateral tectospinal tract
B)  the medial reticulospinal tract
C)  the ventral corticospinal tract
D)  the vestibulospinal tract
E)  the gracile fasciculusF) None of the above
G) B) and C)

Question 9

Cerebrospinal fluid fills in 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 mater.F) A) and B)
G) A) and C)

Question 10

These are all properties of reflexes except

Accepted Answer

A)  reflex responses are very predictable.
B)  reflexes are responses to sensory inputs.
C)  reflexes are quick responses of the nervous system.
D)  reflexes are not voluntary.
E)  reflexes are spontaneous actions of the nervous system.F) A) and B)
G) B) and D)

Question 11

Many upper motor neurons synapse with lower motor neurons in

Accepted Answer

A)  the posterior horns.
B)  the anterior horns.
C)  the posterior column.
D)  the anterior column.
E)  the posterior root ganglion.F) C) and D)
G) A) and B)

Question 12

The signals that control your handwriting travel down the spinal cord in

Accepted Answer

A)  the tectospinal tracts.
B)  the corticospinal tracts.
C)  the lateral vestibulospinal tracts.
D)  the medial vestibulospinal tracts.
E)  the spinocerebellar tracts.F) B) and C)
G) A) and E)

Question 13

A nurse pricks your finger to type your blood.You flinch at the pain, pulling your hand back.This is called the

Accepted Answer

A)  painful reflex.
B)  stretch (myotatic)  reflex.
C)  flexor (withdrawal)  reflex.
D)  tendon reflex.
E)  crossed extension reflex.F) A) and D)
G) A) and E)

Question 14

This figure shows the posterior aspect of spinal nerve roots and plexuses.What does "2" represent?

Accepted Answer

A)  the medulla oblongata
B)  a bundle of spinal nerves
C)  a bundle of cranial nerves
D)  the cervical enlargement
E)  the brachial enlargementF) A) and E)
G) A) and D)

Question 15

Neurosomas of the posterior root are located in the , whereas neurosomas of the anterior root are located in the .

Accepted Answer

A)  posterior root ganglion; gray matter
B)  posterior root ganglion; white matter
C)  gray matter; white matter
D)  posterior root; anterior root
E)  white matter; gray matterF) A) and E)
G) A) and B)

Question 16

The following are all functions associated with the spinal cord except

Accepted Answer

A)  to protect neurons in both the ascending and descending tracts.
B)  to mediate a reflex such as the withdrawal of a hand from pain.
C)  to conduct sensory information up to the brain.
D)  to conduct motor information down the cord.
E)  to coordinate the alternating contraction of several muscle groups associated with locomotion.F) D) and E)
G) A) and C)

Question 17

The ventral rami of the spinal nerves form nerve plexuses in all regions except

Accepted Answer

A)  the thoracic region.
B)  the brachial region.
C)  the cervical region.
D)  the lumbar region.
E)  the sacral region.F) C) and D)
G) A) and D)

Question 18

carry motor commands from the brain along the spinal cord.

Accepted Answer

A)  Both anterior and posterior roots
B)  Ascending tracts
C)  Spinal nerves
D)  Cranial nerves
E)  Descending tractsF) D) and E)
G) A) and B)

Question 19

The sensitivity of the muscle spindle is maintained by

Accepted Answer

A)  a stretch reflex.
B)  alpha motor neurons.
C)  gamma motor neurons.
D)  anulospiral endings.
E)  secondary afferent (group II)  fibers.F) B) and C)
G) All of the above

Question 20

This figure shows a detail of the spinal cord, meninges, and spinal nerves.What does "1" represent?

Accepted Answer

A)  anterior horn
B)  anterior root of a spinal nerve
C)  posterior root of a spinal nerve
D)  posterior horn
E)  spinal nerveF) A) and B)
G) A) and E)

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

The ventral rami of the spinal nerves form nerve plexuses in all regions except

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Cerebrospinal fluid fills in the space between the

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The following are all functions associated with the spinal cord except

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This figure shows a detail of the spinal cord, meninges, and spinal nerves.What does "1" represent?

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Which of these is an ascending tract of the spinal cord?

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A nurse pricks your finger to type your blood.You flinch at the pain, pulling your hand back.This is called the

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carry motor commands from the brain along the spinal cord.

Correct AnswerverifiedShow Answer

This figure shows the posterior aspect of spinal nerve roots and plexuses.What does "3" represent?

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Each portion of the spinal cord served by a spinal nerve is called a segment of the cord.

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

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This figure shows the anatomy of a nerve.What does "3" represent?

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

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The sensitivity of the muscle spindle is maintained by

Correct AnswerverifiedShow Answer

Many upper motor neurons synapse with lower motor neurons in

Correct AnswerverifiedShow Answer

This figure shows the posterior aspect of spinal nerve roots and plexuses.What does "2" represent?

Correct AnswerverifiedShow Answer

The signals that control your handwriting travel down the spinal cord in

Correct AnswerverifiedShow Answer

These are all properties of reflexes except

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

Correct AnswerverifiedShow Answer

Nerve fibers in a given tract in the white matter are similar in origin, destination, and function.

Correct AnswerverifiedShow Answer

Neurosomas of the posterior root are located in the , whereas neurosomas of the anterior root are located in the .

Correct AnswerverifiedShow Answer

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