Deck 16: The Spinal Cord and Spinal Nerves

Question 1

In a two-point discrimination test,the distribution of sensory receptors is ________ related to the distance between the compass points.

A) inversely
B) seldom
C) not
D) directly

Answer 1

A

Question 2

Consider the sensory homunculus.Why is a large portion of the sensory area dedicated to the hands and fingers?

A) Sensory receptors are larger in the hands and fingers than in other parts of the body.
B) Sensory receptors are equally distributed in all body areas.
C) There are fewer sensory receptors in the hands and fingers than in other parts of the body.
D) There are a larger number of sensory receptors in the hands and fingers than in other parts of the body.

Answer 2

D

Question 3

The bony structure that encloses and protects the spinal cord is called the ________.

A) cauda equina
B) conus medullaris
C) dura mater
D) vertebral canal

Answer 3

D

Question 4

The area between the dura mater and the vertebrae is known as the ________.

A) subarachnoid space
B) epidural space
C) filum terminale
D) conus medullaris

Question 5

The ________ connect(s)the pia mater to the dura mater of the spinal cord.

A) denticulate ligaments
B) conus medullaris
C) spinal nerves
D) filum terminale

Question 6

In the spinal cord,the grey matter is ________ to the white matter.

A) superficial
B) deep
C) superior
D) inferior

Question 7

________ is an area on the body monitored by a single sensory neuron.

A) The filum terminale
B) A receptive field
C) The conus medullaris
D) A dermatome

Question 8

During lab class,you conducted a two-point discrimination test on your lab partner.At the tip of the index finger,the two-point discrimination was 5 mm.On the dorsal surface of the hand,the two-point discrimination was 10 mm.Given the results of this test,which of the following statements is true?

A) The density of skin receptors is equal in both areas tested.
B) The density of skin receptors is greater on the dorsal surface of the hand than on the tip of the index finger.
C) The density of skin receptors is greater at the tip of the index finger than on the dorsal surface of the hand.
D) There is not enough information to draw a conclusion about the density of skin receptors in the areas that were tested.

Question 9

Spinal nerves are classified as mixed nerves because they ________.

A) contain sensory nerve fibers only
B) contain neither sensory nor motor nerve fibers
C) contain motor nerve fibers only
D) contain both sensory and motor nerve fibers

Question 10

One difference between the meninges of the brain and the spinal cord is that ________.

A) denticulate ligaments connect the pia mater of the brain to the dura mater of the brain
B) the denticulate ligaments of the dura mater anchor the meninges to the arachnoid mater
C) the dura mater of the spinal cord is not attached to the inner surface of vertebrae, but the dura mater of the brain is attached to the inner surface of the cranial bones
D) There are no differences between the meningeal layers of the brain and spinal cord.

Question 11

The cone-shaped terminal end of the spinal cord is called the ________.

A) subarachnoid space
B) filum terminale
C) epidural space
D) conus medullaris

Question 12

First-order neurons ________.

A) travel to the thalamus and synapse on third-order neurons
B) transmit motor information from a receptor to the central nervous system
C) carry sensory information from a receptor to the central nervous system
D) travel from the thalamus to the cerebral cortex

Question 13

Which spinal nerve is linked to the skin covering the deltoid muscle?

A) C8
B) C7
C) C6
D) C5

Question 14

How many pairs of spinal nerves are there?

A) 31
B) 8
C) 12
D) 5

Question 15

What would be the most immediate consequence of damage to a first-order sensory neuron?

A) This type of damage would not affect the organism.
B) Motor function would be lost.
C) Sensory information would not be transmitted to the cerebral cortex.
D) Sensory information from the receptive field nearest the damaged area would not be transmitted to the CNS.

Question 16

The spinal cord is protected by three layers of connective tissue membranes called the ________.

A) meninges
B) plexuses
C) dermatomes
D) vertebrae

Question 17

What is the role of the adipose tissue in the epidural space?

A) The adipose tissue conducts nerve impulses.
B) The adipose tissue in the epidural cushions dura mater and protects the nerves and blood vessels that it surrounds.
C) The adipose tissue of the epidural space produces myelin.
D) There is no known function of the adipose tissue in the epidural space.

Question 18

Which of the following statements explains why sensations felt on the left side of the body are received by the right cerebral hemisphere?

A) There is no explanation for this occurrence.
B) Axons of third-order neurons cross over to the opposite side of the CNS.
C) First-order neurons cross over to the opposite side of the CNS.
D) Axons of second-order neurons in a sensory pathway cross over to the opposite side of the CNS.

Question 19

Your lab partner does not feel the stick of a needle in the sural region of the leg.Which spinal nerve may be damaged?

A) S₂
B) L₃
C) L₅
D) C₂

Question 20

A sensory cutaneous region,innervated by a single pair of spinal nerves,is called a ________.

A) receptive field
B) dermatome
C) sensory neuron
D) plexus