1. How many pairs of spinal nerves are present in the human peripheral nervous system?
A.
12 pairs
B.
24 pairs
C.
31 pairs
D.
43 pairs
Correct Answer:
31 pairs
Explanation:
Humans have 31 pairs of spinal nerves, which connect the spinal cord with different parts of the body.
2. Spinal nerves are formed by the union of which two roots?
A.
Dorsal and ventral roots
B.
Cranial and caudal roots
C.
Sensory and cranial roots
D.
Cervical and lumbar roots
Correct Answer:
Dorsal and ventral roots
Explanation:
A spinal nerve is formed when the dorsal sensory root joins the ventral motor root.
3. Which root of a spinal nerve carries sensory impulses toward the spinal cord?
A.
Ventral root
B.
Dorsal root
C.
Anterior root
D.
Motor root
Correct Answer:
Dorsal root
Explanation:
The dorsal root carries sensory impulses from receptors toward the spinal cord.
4. Which root of a spinal nerve carries motor impulses away from the spinal cord?
A.
Dorsal root
B.
Posterior root
C.
Ventral root
D.
Sensory root
Correct Answer:
Ventral root
Explanation:
The ventral root carries motor impulses from the spinal cord to muscles and glands.
5. What type of nerve is a spinal nerve after the dorsal and ventral roots unite?
A.
Sensory nerve only
B.
Motor nerve only
C.
Mixed nerve
D.
Cranial nerve
Correct Answer:
Mixed nerve
Explanation:
A spinal nerve is a mixed nerve because it contains both sensory and motor nerve fibers.
6. Which structure is found on the dorsal root of a spinal nerve?
A.
Dorsal root ganglion
B.
Ventral root ganglion
C.
Cerebral ganglion
D.
Autonomic plexus
Correct Answer:
Dorsal root ganglion
Explanation:
The dorsal root ganglion contains the cell bodies of sensory neurons associated with a spinal nerve.
7. How many pairs of cervical spinal nerves are present in humans?
A.
5 pairs
B.
8 pairs
C.
12 pairs
D.
31 pairs
Correct Answer:
8 pairs
Explanation:
There are 8 pairs of cervical spinal nerves, which arise from the cervical region of the spinal cord.
8. How many pairs of thoracic spinal nerves are present in humans?
A.
5 pairs
B.
8 pairs
C.
10 pairs
D.
12 pairs
Correct Answer:
12 pairs
Explanation:
The thoracic region gives rise to 12 pairs of spinal nerves.
9. Which group of spinal nerves contains five pairs?
A.
Cervical nerves
B.
Thoracic nerves
C.
Lumbar nerves
D.
Coccygeal nerves
Correct Answer:
Lumbar nerves
Explanation:
There are five pairs of lumbar spinal nerves in the human body.
10. Which spinal nerves arise from the sacral region of the spinal cord?
A.
Cervical nerves
B.
Thoracic nerves
C.
Lumbar nerves
D.
Sacral nerves
Correct Answer:
Sacral nerves
Explanation:
Sacral spinal nerves arise from the sacral region and form part of the group of 31 pairs of spinal nerves.
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