Question 1

Which reflex shows the least synaptic delay?

Accepted Answer

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

Question 2

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

Accepted Answer

A) True 
 B)False

Question 3

Which of the following is not a distal branch of the spinal nerve?

Accepted Answer

A)   Anterior ramus
B)   Posterior ramus
C)   Posterior root
D)   Meningeal branch
E)   Communicating ramiF) A) and C)
G) B) and E)

Question 4

Which of the following branches of a spinal nerve has the neurosomas of only sensory neurons?

Accepted Answer

A)   Posterior (dorsal) root
B)   Anterior (ventral) root
C)   Posterior ramus
D)   Anterior ramus
E)   Meningeal branchF) None of the above
G) B) and C)

Question 5

Which of the following nerves originates in the lumbosacral plexus?

Accepted Answer

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

Question 6

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

Accepted Answer

A)   Lateral tectospinal tract
B)   Medial reticulospinal tract
C)   Ventral corticospinal tract
D)   Vestibulospinal tract
E)   Gracile fasciculusF) B) and E)
G) D) and E)

Question 7

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

Question 8

The anterior ramus in the thoracic region becomes an intercostal nerve.In other regions,the anterior ramus form spinal plexuses.

Accepted Answer

A) True 
 B)False

Question 9

A mixed nerve consists of both __________ and ___________.

Accepted Answer

A)   myelinated;unmyelinated fibers
B)   glial cells;nerve cells
C)   afferent;efferent fibers
D)   interneurons;efferent neurons
E)   spinal;cranial fibersF) A) and E)
G) None of the above

Question 10

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 __________ and the hamstrings to __________.

Accepted Answer

A)   contract;relax
B)   contract;contract
C)   relax;contract
D)   relax;relaxE) A) and B)
F) A) and C)

Question 11

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

Accepted Answer

A) True 
 B)False

Question 12

Which of the following is not a property of reflexes?

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 do not require a stimulus.F) D) and E)
G) B) and D)

Question 13

Posterior root ganglia contain neurosomas of unipolar neurons.

Accepted Answer

A) True 
 B)False

Question 14

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 E)
G) A) and B)

Question 15

The crossed 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 16

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

Accepted Answer

A) True 
 B)False

Question 17

Nerve fibers are insulated from one another by __________.

Accepted Answer

A)   perineurium
B)   endoneurium
C)   fascicles
D)   epineurium
E)   blood vesselsF) B) and C)
G) A) and D)

Question 18

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

Accepted Answer

A) True 
 B)False

Question 19

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

Accepted Answer

A)   gamma motor neurons
B)   anulospiral endings
C)   intrafusal fibers
D)   extrafusal fibers
E)   alpha motor neuronsF) None of the above
G) B) and C)

Question 20

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

Accepted Answer

A)   painful
B)   stretch
C)   flexor (withdrawal) 
D)   tendon
E)   crossed extensionF) A) and B)
G) A) and D)

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

Which reflex shows the least synaptic delay?

Correct AnswerverifiedShow Answer

A mixed nerve consists of both __________ and ___________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following is not a distal branch of the spinal nerve?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The crossed 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

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 __________ and the hamstrings to __________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following nerves originates in the lumbosacral plexus?

Correct AnswerverifiedShow Answer

Posterior root ganglia contain neurosomas of unipolar neurons.

Correct AnswerverifiedShow Answer

Which of the following is not a property of reflexes?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following is true regarding the tendon reflex?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

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 branches of a spinal nerve has the neurosomas of only sensory neurons?

Correct AnswerverifiedShow Answer

Nerve fibers are insulated from one another by __________.

Correct AnswerverifiedShow Answer

The anterior ramus in the thoracic region becomes an intercostal nerve.In other regions,the anterior ramus form spinal plexuses.

Correct AnswerverifiedShow Answer

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A mixed nerve consists of both and _.

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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 and the hamstrings to .

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