Cranial Nerve V:Trigeminal n. The trigeminal ganglion is locates in the floor of the middle cranial fossa, on the bony depression of petrous temporal bone, has three braches (TG is corresponds to the dorsal root ganglion of the spinal nerveThe trigeminal ganglion is locates in the floor of the middle cranial fossa, on the bony depression of petrous temporal bone, has three braches (TG is corresponds to the dorsal root ganglion of the spinal nerve ) Cranial Nerve V: Trigeminal n