CMD 377 Lecture Notes - Lecture 15: Pupillary Light Reflex, Lateral Rectus Muscle, Superior Oblique Muscle

• School: URI
• Department: Communicative Disorders
• Course: CMD 377
• Professor: Kim Mikyong

Document Summary

Motor nucleus for cn iii located in the midbrain oculomotor nucleus. Supplies the visceral motor component of the following muscles: pupillary sphincter: controls the size of the pupil, ciliary muscles: changes the shape of the lens (accommodation) The nucleus projecting to these muscles - edinger-westphal nucleus (preganglionic parasympathetic neuron: pupillary light reflex: constriction of pupil to light. Shining a light in one eye results in constriction of both pupils: accommodation reflex: reflex changes that enable an object to be focused on the retina. Supplies the superior oblique muscles: concerned with the downward movement of the eye (when in medial position) Cell bodies located in the contralateral trochlear muscles. Cn iv is the only cn that is: attached to the dorsal surface of the brainstem, completely crossed (originating from a contralateral nucleus) Damage to the nerve results in less significant deficit. Damage results in diplopia, when attempting to move eyes downward: difficulty in descending stairs and reading.