Trigeminal Nucleus

**Semantic type:** Body Part, Organ, or Organ Component

**Definition:** Any one of the four nuclei of the fifth cranial nerve located in the brain stem, which includes the principal sensory nucleus, the mesencephalic nucleus, the spinal trigeminal tract, and the motor nucleus.

**Synonyms:** - Nucleus of Fifth Nerve - Nucleus of the Fifth Nerve - Trigeminal Nuclei