GROSS ANATOMY
CRANIAL NERVES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Optic (II)
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Oculomotor (III)
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Trochlear (IV)
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All of these innervate the eye.
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Detailed explanation-1: -Which of the following cranial nerves does not innervate extrinsic eye muscles? (e) Trigeminal.
Detailed explanation-2: -The vagus nerve provides autonomic nerve inputs to various visceral structures in the body, such as the lungs, heart, and digestive tract. The vagus nerve, however, does not provide any motor fibers to the eye.
Detailed explanation-3: -Six cranial nerves innervate motor, sensory, and autonomic structures in the eyes. The six cranial nerves are the optic nerve (CN II), oculomotor nerve (CN III), trochlear nerve (CN IV), trigeminal nerve (CN V), abducens nerve (CN VI), and facial nerve (CN VII).
Detailed explanation-4: -Cranial nerves III (CNIII) (oculomotor), IV (trochlear), and VI (abducens) control the position of the eyeballs; CNIII influences the position of the eyelids and the size of the pupils.
Detailed explanation-5: -The optic nerve is more involved with vision and does not innervate the ocular muscles.