Ch. 5: Spinal Cord

Question 1

The white matter of the spinal cord does not contain:
A. Neuroglia
B. Endothelium
C. Perikarya
D. Axons

Answer 1

C. Perikarya

Question 2

T/F: Dorsal roots are formed by central processes of the dorsal root ganglia.

Answer 2

True

Question 3

A spinal cord segment is defined by:
A. The section of spinal cord directly corresponding to every vertebrae
B. A line drawn midway between rootlets of the adjacent spinal roots.
C. A line drawn at the rootlets of the spinal roots

Answer 3

B. A line drawn midway between rootlets of the adjacent spinal roots.

Question 4

There are \_\_\_\_\_ cervical vertebrae and \_\_\_\_\_ cervical spinal cord segments.
A. 8, 7
B. 7, 8
C. 8, 8
D. 7, 7

Answer 4

B. 7, 8

Question 5

The dorsal funiculus is:
A. A white matter bounded by the dorsal median and dorsolateral sulci
B. A white matter bounded by the dorsolateral and ventral median fissure
C. A gray matter lateral to the dorsal median septum
D. A gray matter lateral to the central canal

Answer 5

A. A white matter bounded by the dorsal median and dorsolateral sulci

Question 6

Laminae VIII and IX of the gray matter represent:
A. Dorsal horn
B. Ventral funiculus
C. Intermediate substance
D. Ventral horn

Answer 6

D. Ventral horn

Question 7

T/F: The cervical enlargement of the spinal cord corresponds to C1-C5.

Answer 7

False

Question 8

Interneurons in the spinal cord are:
A. The same as motor neurons
B. Always excitatory
C. Always inhibitory
D. Either excitatory or inhibitory

Answer 8

D. Either excitatory or inhibitory

Question 9

T/F: Motor neurons are AKA projection neurons as they project axons to skeletal muscles.

Answer 9

False

Question 10

Visceral motor neurons are located in the:
A. T1-L3 and S2-S3
B. T1-L3 only
C. S2-S3 only
D. C6-T1

Answer 10

A. T1-L3 and S2-S3

Question 11

Lower motor neurons are located in the:
A. Dorsal horn
B. Ventral horn
C. Cerebral motor cortex
D. Thalamus

Answer 11

B. Ventral horn

Question 12

T/F: Each skeletal muscle fiber is innervated by various numbers of spinal motor neurons.

Answer 12

False

Question 13

T/F: A motor unit is defined as a motor neuron and all the skeletal muscle fibers it innervates.

Answer 13

True

Question 14

Visceral motor neurons are located in the:
A. Dorsal horn
B. Ventral horn
C. Intermediate substance

Answer 14

C. Intermediate substance

Question 15

Motor neurons in the ventral horn and their axons are classified as:
A. General somatic efferent (GSE)
B. General somatic afferent (GSA)
C. General visceral efferent (GVE)
D. General visceral afferent (GVA)

Answer 15

A. General somatic efferent (GSE)

Question 16

The pelvic limbs of a dog are paralyzed. Pain sensation is also absent in both limbs, and the quadriceps reflex is absent in both pelvic limbs. The thoracic limbs show normal motor control and sensory perception. A lesion in this animal is most likely present somewhere in the:
A. Cord segments C1-C5
B. Cord segments C6-T1
C. Cord segments T3-L3
D. Cord segments L4-S1

Answer 16

D. Cord segments L4-S1