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Multiple Choice
Which of the following cranial nerves carries only motor information?
A
Oculomotor nerve (CN III)
B
Optic nerve (CN II)
C
Vestibulocochlear nerve (CN VIII)
D
Trigeminal nerve (CN V)
Verified step by step guidance
1
Understand the basic functions of cranial nerves: Cranial nerves can carry sensory information, motor information, or both. Sensory nerves are responsible for transmitting sensory data to the brain, while motor nerves control muscle movements.
Identify the function of each cranial nerve listed: Determine whether each nerve is primarily sensory, motor, or mixed (both sensory and motor).
Analyze the Oculomotor nerve (CN III): This nerve is primarily responsible for controlling most of the eye's movements, including constriction of the pupil and maintaining an open eyelid. It is a motor nerve.
Evaluate the Optic nerve (CN II): This nerve is responsible for transmitting visual information from the retina to the brain. It is a sensory nerve.
Consider the Vestibulocochlear nerve (CN VIII) and Trigeminal nerve (CN V): The Vestibulocochlear nerve is involved in hearing and balance (sensory), while the Trigeminal nerve is responsible for facial sensations and motor functions like biting and chewing (mixed).