GROSS ANATOMY

Detailed explanation-1: -The oculomotor nerve helps to adjust and coordinate eye position during movement. Several movements assist with this process: saccades, smooth pursuit, fixation, accommodation, vestibulo-ocular reflex, and optokinetic reflex.

Detailed explanation-2: -The parasympathetic fibers from the oculomotor nerve innervate two muscles inside the iris: Sphincter pupillae: Constricts (shrinks) the pupil. Ciliary muscles: Change the curvature and thickness of your lens so you can focus on objects at different distances.

Detailed explanation-3: -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-4: -What are the functions of the oculomotor nerve? Nerve III controls muscles that turn eyeball up, down, and medially as well as controlling the iris, lens, and the upper eyelid.

Detailed explanation-5: -Answer and Explanation: The trigeminal nerve (V) is not involved with controlling eye movement, which is consistent with answer choice B. The trigeminal nerve is responsible for the sensation of the face but does not innervate the muscles of the eye. Three cranial nerve pairs control the movement of the eyes.