The sensory<unk> s is the largest of the cranial nerve nuclei, and extends through the whole of the brainstem, midbrain to medulla.
The nucleus is divided into three parts, from rostral to caudal (top to bottom in humans):
The mesencephalic nucleus
The chief sensory nucleus (or "pontine nucleus")
The spinal<unk>  nucleus
There is also a distinct<unk>  motor nucleus that is medial to the chief sensory nucleus.
Trigeminal nerve nuclei
Cranial nerve nucleus
Vestibular nuclei
Cochlear nuclei
Trigeminal motor nucleus
Tectospinal tract
Corticobulbar tract
Optic chiasm