Question 1

Which one of the following best describes the order of a somatic reflex?

Accepted Answer

A)  Somatic receptor  →\rarr→  interneuron  →\rarr→  afferent nerve fiber  →\rarr→  efferent nerve fiber  →\rarr→  skeletal muscle
B)  Somatic receptor  →\rarr→  efferent nerve fiber  →\rarr→  interneuron  →\rarr→  afferent nerve fiber  →\rarr→  skeletal muscle
C)  Somatic receptor  →\rarr→  afferent nerve fiber  →\rarr→  interneuron  →\rarr→  efferent nerve fiber  →\rarr→  skeletal muscle
D)  Somatic receptor  →\rarr→  efferent nerve fiber  →\rarr→  afferent nerve fiber  →\rarr→  interneuron  →\rarr→  skeletal muscle
E)  Somatic receptor  →\rarr→  afferent nerve fiber  →\rarr→  interneuron  →\rarr→  efferent nerve fiber  →\rarr→  smooth muscle F) C) and D)
G) C) and E)

Question 2

Many upper motor neurons synapse with lower motor neurons in the ___________.

Accepted Answer

A)  posterior horn
B)  anterior horn
C)  posterior column
D)  anterior column
E)  posterior root ganglionF) C) and D)
G) A) and C)

Question 3

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

Accepted Answer

A)  tectospinal
B)  corticospinal
C)  lateral vestibulospinal
D)  medial vestibulospinal
E)  spinocerebellarF) None of the above
G) A) and B)

Question 4

The cervical plexus is the origin of the __________ nerve(s) .

Accepted Answer

A)  oculomotor
B)  sciatic
C)  musculocutaneous
D)  radial
E)  phrenicF) B) and C)
G) A) and C)

Question 5

Which of the following is true regarding the tendon reflex?

Accepted Answer

A)  It causes a muscle that is being stretched to contract.
B)  It makes the contralateral motor neurons contract.
C)  It makes the ipsilateral motor neurons relax.
D)  It prevents overcontraction of a muscle.
E)  It causes a tendon to contract.F) A) and B)
G) A) and E)

Question 6

There are __________ pairs of spinal nerves.

Accepted Answer

A)  12
B)  24
C)  31
D)  35
E)  62F) A) and E)
G) All of the above

Question 7

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

Accepted Answer

A) True 
 B)False

Question 8

You go to the movies after a long day and you begin to nod off as soon as the movie starts.Your head starts to lower a little,but a reflex causes your head to rise.This is called the __________ reflex.

Accepted Answer

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

Question 9

Ascending signals in the spinal cord travel via gray matter,while descending signals travel via white matter.

Accepted Answer

A) True 
 B)False

Question 10

Reflex arcs that only use two neurons are called ____________ reflex arcs.

Accepted Answer

A)  ipsilateral
B)  contralateral
C)  polysynaptic
D)  monosynaptic
E)  autonomicF) B) and C)
G) C) and E)

Question 11

The structure found between the posterior rootlets and the posterior root ganglion is called the __________.

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) C) and D)
G) B) and D)

Question 12

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

Question 13

The anterior rami of the spinal nerves form nerve plexuses in all regions except the _________ region.

Accepted Answer

A)  thoracic
B)  cervical
C)  lumbar
D)  sacralE) All of the above
F) B) and C)

Question 14

Which of the following nerves originates in the lumbosacral plexus?

Accepted Answer

A)  Axillary
B)  Sciatic
C)  Phrenic
D)  Ilioinguinal
E)  ObturatorF) A) and B)
G) C) and D)

Question 15

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

Question 16

Most nerves are motor nerves.

Accepted Answer

A) True 
 B)False

Question 17

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 C)
G) A) and D)

Question 18

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) 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)  fibersF) C) and E)
G) B) and E)

Question 20

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

Accepted Answer

A) True 
 B)False

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

Which one of the following best describes the order of a somatic reflex?

Correct AnswerverifiedShow Answer

Ascending signals in the spinal cord travel via gray matter,while descending signals travel via white matter.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

There are __________ pairs of spinal nerves.

Correct AnswerverifiedShow Answer

Many upper motor neurons synapse with lower motor neurons in the ___________.

Correct AnswerverifiedShow Answer

Reflex arcs that only use two neurons are called ____________ reflex arcs.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The anterior rami of the spinal nerves form nerve plexuses in all regions except the _________ region.

Correct AnswerverifiedShow Answer

Most nerves are motor nerves.

Correct AnswerverifiedShow Answer

A __________ is a cordlike organ composed of numerous __________.

Correct AnswerverifiedShow Answer

You go to the movies after a long day and you begin to nod off as soon as the movie starts.Your head starts to lower a little,but a reflex causes your head to rise.This is called the __________ reflex.

Correct AnswerverifiedShow Answer

Which of the following is contained within gray matter?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The structure found between the posterior rootlets and the posterior root ganglion is called the __________.

Correct AnswerverifiedShow Answer

The sensitivity of the muscle spindle is maintained by __________.

Correct AnswerverifiedShow Answer

The cervical plexus is the origin of the __________ nerve(s) .

Correct AnswerverifiedShow Answer

Which of the following is true regarding the tendon reflex?

Correct AnswerverifiedShow Answer

Which of the following nerves originates in the lumbosacral plexus?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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A is a cordlike organ composed of numerous .

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