Ch. 5: Spinal Cord Flashcards
The white matter of the spinal cord does not contain: A. Neuroglia B. Endothelium C. Perikarya D. Axons
C. Perikarya
T/F: Dorsal roots are formed by central processes of the dorsal root ganglia.
True
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
B. A line drawn midway between rootlets of the adjacent spinal roots.
There are \_\_\_\_\_ cervical vertebrae and \_\_\_\_\_ cervical spinal cord segments. A. 8, 7 B. 7, 8 C. 8, 8 D. 7, 7
B. 7, 8
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
A. A white matter bounded by the dorsal median and dorsolateral sulci
Laminae VIII and IX of the gray matter represent: A. Dorsal horn B. Ventral funiculus C. Intermediate substance D. Ventral horn
D. Ventral horn
T/F: The cervical enlargement of the spinal cord corresponds to C1-C5.
False
Interneurons in the spinal cord are: A. The same as motor neurons B. Always excitatory C. Always inhibitory D. Either excitatory or inhibitory
D. Either excitatory or inhibitory
T/F: Motor neurons are AKA projection neurons as they project axons to skeletal muscles.
False
Visceral motor neurons are located in the: A. T1-L3 and S2-S3 B. T1-L3 only C. S2-S3 only D. C6-T1
A. T1-L3 and S2-S3
Lower motor neurons are located in the: A. Dorsal horn B. Ventral horn C. Cerebral motor cortex D. Thalamus
B. Ventral horn
T/F: Each skeletal muscle fiber is innervated by various numbers of spinal motor neurons.
False
T/F: A motor unit is defined as a motor neuron and all the skeletal muscle fibers it innervates.
True
Visceral motor neurons are located in the:
A. Dorsal horn
B. Ventral horn
C. Intermediate substance
C. Intermediate substance
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)
A. General somatic efferent (GSE)
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
D. Cord segments L4-S1
