Structure

The trigeminal ganglion is somewhat crescent-shaped, with its convexity directed anterolaterally. From its convex border arise the ophthalmic nerve (V₁), maxillary nerve (V₂), and mandibular nerve (V₃).^[2]

The ganglion receives, on its medial side, filaments from the carotid plexus of the sympathetic. It issues minute branches to the tentorium cerebelli, and the dura mater in the middle cranial fossa.^{[citation needed]}

Relations

Medially to the trigeminal ganglion are the internal carotid artery, and the posterior part of the cavernous sinus.^[2]

The motor root of the trigeminal nerve passes beneath the trigeminal ganglion to exit the skull through the foramen ovale.^[2] The greater petrosal nerve passes underneath the trigeminal ganglion to reach the foramen lacerum.^{[3]: 498, 509}

Herpes virus dormancy

After recovery from a primary herpes infection, the virus is not cleared from the body, but rather lies dormant in a non-replicating state within the trigeminal ganglion.^[4]

Lesions

If the trigeminal ganglion is damaged, by infection or surgery, it gives rise to the trigeminal trophic syndrome, which involves paresthesias and anesthesia, and may lead to erosions of the nasal ala.^{[citation needed]}

Ablation in trigeminal neuralgia

The thermocoagulation or injection of glycerol into the trigeminal ganglion has been used in the treatment of trigeminal neuralgia.^{[citation needed]}

Rodents

In rodents, the trigeminal ganglion is important as it is the first part of the pathway from the whiskers to the brain. Cell bodies of the whisker primary afferents are found here. These afferents are mechanoreceptor cells that fire in response to whisker deflection.^{[citation needed]}

There are around 26,000–43,000 cell bodies in rodent trigeminal ganglion. It is possible that there are two distinct (or perhaps continuous) populations of cells having slowly and rapidly adapting responses to stimuli.^{[citation needed]}

It is found at the base of the skull and projects to trigeminal brain stem areas including principalis, spinal trigeminal nucleus, interpolaris, and caudalis.^{[citation needed]}