![]() ![]() It is important to note that CN III palsy can be partial, and only some of the signs and symptoms may be present. Being aware of which types of nerve fiber bundles run on the outside and inside of CN III can help to understand why specific symptoms of cranial nerve palsy occur. Voluntary motor fibers run on the inside of the nerve, and involuntary fibers run on the outside of the nerve. The third cranial nerve has two types of fibers that are bundled on the inner and outer sections of the nerve. The oculomotor nerve is a motor nerve that causes the eyes to move. The prefix “oculo-” means relating to the eyes or vision. Understanding the functions of the third cranial nerve will make it easier to understand what happens when it is not functioning properly. Symptoms of third nerve palsy are double vision, droopy eyelids, dilated pupil and a down-and-out gaze. Imaging tests will need to be ordered to check for an aneurysm, herniation or tumor in the brain compressing the nerve. If someone is experiencing symptoms of third nerve palsy, it is important that they see a doctor as soon as possible, particularly if the pupil is dilated. Due to this, only one eye is usually affected by third nerve palsy. ![]() It also carries the nerve fibers that make the pupil smaller and lift the eyelid.Įach cranial nerve pair innervates the left and right sides of the face. CN III carries signals from the brain to most of the muscles that move the eye. It is one of 12 pairs of nerves that lead from the brain to the face, head or torso. The third cranial nerve is the oculomotor nerve (CN III). A sudden onset of symptoms is a medical emergency. It can be present at birth or be the result of an injury, disease or infection. This results in symptoms such as misaligned eyes, double vision, drooping eyelid or enlarged pupil. Third cranial nerve palsy occurs when CN III loses function.
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