substantial input to the same territory of the mesencephalic reticular formation appears to come from the superior colliculus , the substantia nigra , the parabrachial area , the spinal trigeminal nucleus , and the nucleus reticularis gigantocellularis , whereas several other brain structures , among which the locus coeruleus and the raphe complex , seem to represent modest but consistent additional input sources .
C0006104
brain structures
C0034671
raphe