pituitary gland development trait Rathke's pouch morphology trait Any measurable or observable characteristic related to the shape, structure, color, or pattern of the pouch of ectoderm that grows out from the upper surface of the embryonic stomodeum and gives rise to the anterior and intermediate lobes of the pituitary gland. Trait.ontology pituitary diverticulum morphology trait Rathke's pocket morphology trait VT:0003817