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In neuroanatomy, the trigeminal nerve (lit. triplet nerve), also known as the fifth cranial nerve, cranial nerve V, or simply CN V, is a cranial nerve responsible for sensation in the face and motor functions such as biting and chewing; it is the most complex of the cranial nerves.
The trigeminal nerve is a paired cranial nerve that has three major branches: the ophthalmic nerve (V 1), the maxillary nerve (V 2), and the mandibular nerve (V 3). One, two, or all three branches of the nerve may be affected. Trigeminal neuralgia most commonly involves the middle branch (the maxillary nerve or V 2) and lower branch (mandibular ...
The trigeminovascular system (TVS) refers to neurons and their axonal projections within the trigeminal nerve that project to the cranial meninges and meningeal blood vessels [1] [2] residing on the brain's surface. [3]
The jaw jerk reflex or the masseter reflex is a stretch reflex used to test the status of a patient's trigeminal nerve (cranial nerve V) and to help distinguish an upper cervical cord compression from lesions that are above the foramen magnum.
Vascular compression of the trigeminal nerve, infections of the teeth or sinuses, physical trauma, or past viral infections are possible causes of ATN. [2] In the case of trigeminal neuralgia, the affected nerves are responsible for sensing touch, temperature sensation and pressure sensation in the facial area from the jaw to the forehead.
Some sources prefer the term "branchiomotor" [2] or "branchial efferent". [ 3 ] The only nerves containing SVE fibers are cranial nerves : the trigeminal nerve (V), the facial nerve (VII), the glossopharyngeal nerve (IX), the vagus nerve (X) and the accessory nerve (XI).
It compresses the trigeminal nerve (CN V), causing pain on the patient's face (the distribution of the nerve). This may be treated with vascular microsurgery to decompress the trigeminal nerve. [2] At autopsy, 50% of people without trigeminal neuralgia will also be noted to have vascular compression of the nerve. [3]
The trigeminal ganglion contains cell bodies of the pseudo-unipolar sensory neurons of the trigeminal nerve which extend their axons both distally/peripherally into the three divisions of the trigeminal nerve on the one end, and proximally/centrally to the brainstem on the other end; the trigeminal root extends from the trigeminal ganglion to the ventrolateral aspect of the pons.