Rodent
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.
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.
It is found at the base of the skull and projects to trigeminal brain stem areas including principalis, spinal trigeminal nucleus, interpolaris, and caudalis.
Read more about this topic: Trigeminal Ganglion