Which of the following is NOT one of the major parasympathetic contributions to the eye?

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Prepare for the NBEO Ocular Anatomy Posterior Segment and Cranial Nerves Test. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

Which of the following is NOT one of the major parasympathetic contributions to the eye?

Explanation:
The eye’s parasympathetic output mainly travels with CN III to the iris sphincter and to the ciliary muscle, producing pupil constriction and accommodation, and with CN VII to the lacrimal gland, driving tear secretion. The muscle of Muller, a smooth muscle in the eyelid, is not driven by parasympathetic input; it receives sympathetic innervation from the superior cervical ganglion. So CN VII to muscle of Muller is not a parasympathetic contribution, making it the correct choice for what is NOT a parasympathetic input to the eye.

The eye’s parasympathetic output mainly travels with CN III to the iris sphincter and to the ciliary muscle, producing pupil constriction and accommodation, and with CN VII to the lacrimal gland, driving tear secretion. The muscle of Muller, a smooth muscle in the eyelid, is not driven by parasympathetic input; it receives sympathetic innervation from the superior cervical ganglion. So CN VII to muscle of Muller is not a parasympathetic contribution, making it the correct choice for what is NOT a parasympathetic input to the eye.

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