The motor nucleus is located in the upper pons and gives off the smaller motor root which bypasses the trigeminal ganglion and innervates the muscles of mastication as well as the mylohyoid, anterior belly of digastric, tensor tympani and tensor palatini muscles. spinal nucleus: lower pons to upper cervical cord (as far as the third cervical segment), is responsible for pain and temperature additionally it receives afferent fibers from the glossopharyngeal nerve and vagus nerve.main sensory nucleus: located in the upper pons, lateral to the motor nucleus, is responsible for touch sensation for all three trigeminal divisions.mesencephalic nucleus: proprioceptive fibers for muscles of the face, orbit, mastication, and tongue extends through the whole length of the midbrain, lateral to the cerebral aqueduct.The sensory nuclei are arranged in a column which spans from the midbrain through the pons and medulla and into the upper cervical cord. There are four cranial nerve nuclei: three sensory and one motor.
It swaps parasympathetic fibers and taste fibers somewhat haphazardly and divides into numerous terminal branches. It is both large and complicated and has multiple brainstem nuclei (sensory and motor) as well as many interconnections with other cranial nerves.
The trigeminal nerve, also known as the fifth (or V) cranial nerve, is a cranial nerve and its primary role is relaying sensory information from the face and head, although it does provide motor control to the muscles of mastication.