Question 1

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

Accepted Answer

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

Question 2

In the patellar tendon reflex arc, the patellar ligament is stretched, which stretches the quadriceps femoris muscle of the thigh.This reflex will cause the quadriceps femoris to

Accepted Answer

A)  contract and the antagonist muscles, the hamstrings, to relax.
B)  contract and the hamstrings also to contract.
C)  relax and the hamstrings to contract.
D)  relax and the hamstrings also to relax.
E)  relax without any effect on the hamstrings.F) A) and B)
G) B) and C)

Question 3

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

Accepted Answer

A) True 
 B)False

Question 4

If a bee sting on the right thigh causes a quick involuntary reaction of the right arm, this would be an example of

Accepted Answer

A)  an ipsilateral reflex.
B)  an intersegmental reflex.
C)  a withdrawal reflex.
D)  a crossed extensor reflex.
E)  a contralateral reflex.F) D) and E)
G) A) and B)

Question 5

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 this reflex causes your head to rise.This is called the

Accepted Answer

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

Question 6

The bundle of nerve roots that occupy the vertebral canal from L2 to S5 is called the

Accepted Answer

A)  medullary cone.
B)  cauda equina.
C)  lumbar enlargement.
D)  cervical enlargement.
E)  spinal cord.F) None of the above
G) A) and C)

Question 7

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 E)

Question 8

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

Accepted Answer

A)  somatic receptor → interneuron → afferent nerve fiber → efferent nerve fiber → skeletal muscle
B)  somatic receptor → efferent nerve fiber → interneuron → afferent nerve fiber → skeletal muscle
C)  somatic receptor → afferent nerve fiber → interneuron → efferent nerve fiber → skeletal muscle
D)  somatic receptor → efferent nerve fiber → afferent nerve fiber → interneuron → skeletal muscle
E)  somatic receptor → afferent nerve fiber → interneuron → efferent nerve fiber → smooth muscleF) C) and D)
G) A) and B)

Question 9

There are pairs of spinal nerves.

Accepted Answer

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

Question 10

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 oblongata.F) A) and B)
G) C) and E) A

Question 11

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

Accepted Answer

A)  smell
B)  hearing
C)  touch
D)  taste
E)  visionF) None of the above
G) A) and B)

Question 12

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

Accepted Answer

A) True 
 B)False

Question 13

Somatosensory refers to these sensory signals except the sensory signals from

Accepted Answer

A)  bones and muscles.
B)  joints.
C)  proprioceptors.
D)  the viscera.
E)  the skin.F) A) and C)
G) A) and B)

Question 14

A stretch reflex is often accompanied by reciprocal inhibition.

Accepted Answer

A) True 
 B)False  True

Question 15

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

Accepted Answer

A) True 
 B)False

Question 16

Tendon organs are

Accepted Answer

A)  chemoreceptors.
B)  visceral receptors.
C)  proprioceptors.
D)  pain receptors.
E)  nociceptors.F) A) and B)
G) D) and E)

Question 17

The quickest reflex arcs involve only two neurons, thus forming reflex arcs.

Accepted Answer

A)  ipsilateral
B)  contralateral
C)  polysynaptic
D)  monosynaptic
E)  autonomicF) A) and B)
G) All of the above

Question 18

This figure shows a cross section of the spinal cord.What does "3" represent?

Accepted Answer

A)  anterior horn
B)  posterior horn
C)  anterior column
D)  posterior column
E)  anterior root of spinal cordF) A) and E)
G) All of the above

Question 19

This reflex shows the least synaptic delay.

Accepted Answer

A)  polysynaptic reflex
B)  cross extension reflex
C)  withdrawal reflex
D)  flexor reflex
E)  tendon reflexF) C) and D)
G) B) and E)

Question 20

A muscle spindle contains mostly

Accepted Answer

A)  glial cells.
B)  muscle fibers.
C)  fascicles.
D)  nerves.
E)  nerve cells.F) A) and D)
G) None of the above B

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

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

Correct AnswerverifiedShow Answer

In the patellar tendon reflex arc, the patellar ligament is stretched, which stretches the quadriceps femoris muscle of the thigh.This reflex will cause the quadriceps femoris to

Correct AnswerverifiedShow Answer

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

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

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 this reflex causes your head to rise.This is called the

Correct AnswerverifiedShow Answer

The bundle of nerve roots that occupy the vertebral canal from L2 to S5 is called the

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

There are pairs of spinal nerves.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedA

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Somatosensory refers to these sensory signals except the sensory signals from

Correct AnswerverifiedShow Answer

A stretch reflex is often accompanied by reciprocal inhibition.

Correct AnswerverifiedTrue

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

Correct AnswerverifiedShow Answer

Tendon organs are

Correct AnswerverifiedShow Answer

The quickest reflex arcs involve only two neurons, thus forming reflex arcs.

Correct AnswerverifiedShow Answer

This figure shows a cross section of the spinal cord.What does "3" represent?

Correct AnswerverifiedShow Answer

This reflex shows the least synaptic delay.

Correct AnswerverifiedShow Answer

A muscle spindle contains mostly

Correct AnswerverifiedB

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A

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True

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B