What is the function of cranial nerve 3?

The oculomotor nerve (the third cranial nerve; CN III) has three main motor functions: Innervation to the pupil and lens (autonomic, parasympathetic) Innervation to the upper eyelid (somatic) Innervation of the eye muscles that allow for visual tracking and gaze fixation (somatic)

What happens when cranial nerve 3 is damaged?

Background. The oculomotor (third) cranial nerve plays an important role in the efferent visual system by controlling ipsilateral eye movements, pupil constriction, and upper eyelid elevation. Accordingly, damage to the third cranial nerve may cause diplopia, pupil mydriasis, and/or upper eyelid ptosis.

What is CN V3 nerve?

Mandibular Nerve (V3) The sensory portion is responsible for pain and temperature information from the mandibular teeth, buccal mucosa, temporomandibular joint, the anterior two-thirds of the tongue, and the face below the territory of the maxillary nerve.

What is the glossopharyngeal nerve responsible for?

As stated above, the glossopharyngeal nerve provides motor innervation to the stylopharyngeus muscle, which is responsible for elevating the pharynx and larynx.

Is cranial nerve 3 sensory or motor?

motor nerves
Cranial nerves III, IV, VI, XI, and XII are pure motor nerves. Cranial nerves V, VII, IX, and X are mixed sensory and motor nerves. The olfactory nerve (CN I) contains special sensory neurons concerned with smell.

Which aneurysm causes 3rd nerve palsy?

When presenting acutely, palsy of the third cranial nerve is often a harbinger of an unstable aneurysm. These symptomatic aneurysms frequently arise from the posterior communicating artery (PCOM), which is the most common type of aneurysm to form in the basal cistern.

Is 3rd nerve palsy an emergency?

A third nerve palsy is an ocular emergency that requires an urgent referral. Paresis of the third nerve can occur anywhere along its course from the midbrain to the orbit. Underlying etiologies can be life threatening and immediate neuroimaging is warranted to ensure there is no intracranial mass or aneurysm.

Where is the V3 nerve?

The Mandibular Nerve (V3) The buccal nerve pierces the skin on the face behind the ramus of the mandible, passes in front of the masseter, and innervates the skin anteriorly of the buccinator muscle.

Where is the 3rd cranial nerve located?

midbrain
CN III starts in the midbrain. It travels through many structures in your head until it reaches the back of your eyes. Its course includes: Exiting the front of the midbrain.

What is the function of the Glossopharyngeal nerve?