Question

Movements and pupillary response of a client's left eye are normal. The right eye looks downward and outward. The pupil is dilated and unresponsive to light, and the eyelid droops. Where is lesion?

Answer 1

The clinical presentation suggests a lesion affecting the right oculomotor nerve, which is responsible for controlling eye movements, eyelid elevation, and pupil constriction.

Step-by-step explanation:

The symptoms described suggest a lesion affecting the right oculomotor nerve. The drooping of the eyelid (ptosis), the abnormal position of the eye (downward and outward), the pupillary dilatation, and the lack of response to light all indicate dysfunction in the nerve that controls these functions. The oculomotor nerve (Cranial Nerve III) innervates the majority of the extraocular muscles, as well as the muscles responsible for pupil constriction and opening the eyelid. Damage to this nerve can lead to the eye being 'down and out' due to unopposed action of the lateral rectus and superior oblique muscles, a dilated pupil from loss of parasympathetic input that would normally constrict the pupil, and drooping of the upper eyelid because the levator palpebrae superioris muscle cannot receive signals to contract.

Answer 2

Right oculomotor nerve

Step-by-step explanation:

The oculomotor nerve is the third cranial nerve.

It contains fibers that supplies nerves to the extrinsic eye muscles which enables movements and pupillary response such as eye movement ,response to light and raising of the eyelids.

It enters the obit via the superior orbital fissure.

Therefore, when a patient's right eye has dilated pupils, unresponsive to light and the eyelids drops. The lesion is on the oculomotor nerve.