Trigeminal Neuralgia

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Introduction to trigeminal neuralgia

The brain is connected to the body by the spinal cord with spinal nerves sending and receiving impulses and messages to and from the brain. However, there are twelve cranial nerves that directly connect to the body. These nerves are involved with the muscle and sensory function of the head and neck. (The exception is cranial nerve X or the vagus nerve, which is also responsible for the parasympathetic system of the chest and abdomen).

12 Cranial Nerves
Cranial Nerve Name Function
I Olvactory Smell
II Optic Vision
III, IV, VI Oculomoter, Trochlear, Abducens Eye movement
V Trigeminal Facial sensation, chewing
VII Facial Facial movement
VIII Auditory Hearing
IX Glossopharyngeal Taste, swallowing
X Vagus Swallowing, voice modulation, parasympathetic tone of the body
XI Accessory Neck muscles
XII Hypoglossal Swallowing, speech articulation

The trigeminal nerve (cranial nerve V) is so named because it has three (tri) branches responsible for face sensation; one branch also regulates chewing.

  • The ophthalmic branch (V1) is responsible for sensation from the scalp, forehead, upper eyelid and tip of the nose.
  • The maxillary branch (V2) sensation covers the lower eyelid, the side of the nose, the upper lip and cheek, and the upper teeth and gums.
  • The mandibular branch (V3) is responsible for sensation of the lower teeth and gums, lower lip, chin, jaw, and part of the ear. It is also responsible for supplying the muscles involved with chewing (mastication), those muscles involved with chewing.

What is trigeminal neuralgia?

Trigeminal neuralgia is inflammation of the trigeminal nerve, causing intense facial pain. It is also known as tic douloureax because the intense pain can cause patients to contort their face into a grimace and cause the head to move away from the pain. The obvious movement is known as a tic.

The pain of trigeminal neuralgia is intense and may be an isolated episode or may be occur every few hours, minutes, or seconds. There can be months or years between attacks, but in some patients whose pain is not well controlled; it can lead to a chronic pain syndrome, affecting activities of daily life and cause depression.

Though it can affect people of any age, trigeminal neuralgia tends to afflict people older than 60 years of age. It affects the right side of the face five times more often than the left.

What causes trigeminal neuralgia?

Most often, the cause of trigeminal neuralgia is idiopathic, meaning the cause is not known. There are some instances when the nerve can be compressed by nearby blood vessels, aneurysms, or tumors.

There are inflammatory causes of trigeminal neuralgia because of systemic diseases including multiple sclerosis, sarcoidosis, and Lyme disease. There also is an association with collagen vascular diseases including scleroderma and systemic lupus erythematosus.

Medically Reviewed by a Doctor on 8/5/2013

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