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Rathke's pouch
In embryogenesis, Rathke's pouch is a depression in the roof of the developing mouth in front of the buccopharyngeal membrane. It gives rise to the anterior pituitary (adenohypophysis), a part of the endocrine system.
==Development==
Rathke's pouch, and therefore the anterior pituitary, is derived from ectoderm.
The pouch eventually loses its connection with the pharynx giving rise to the anterior pituitary. The anterior wall of Rathke's pouch proliferates, filling most of the pouch to form ''pars distalis'' and ''pars tuberalis''. The posterior wall forms ''pars intermedia''.
In some organisms, the proliferating anterior wall does not fully occupy Rathke's pouch, leaving a remnant (Rathke's cleft) between the ''pars distalis'' and ''pars intermedia''.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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