Meaning of Rathke's pouch

Rath'ke's pouch'

Pronunciation: (rät'kuz), [key]
— Embryol. Embryol.
  1. an invagination of stomodeal ectoderm developing into the anterior lobe of the pituitary gland. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.