neurotensin-like immunoreactivity-containing cells first appear in the primordium of the n. tractus solitarii , n. tractus spinalis nervi trigemini , reticular formation just medial to the latter nucleus , n. reticularis parvocellularis , n. laterodorsalis tegmenti , and midbrain reticular formation of the fetus at gestational day 17 .
C0007634
cells
C0007610
nucleus