Pathology of the Pituitary

摘要: The pituitary gland comprises two lobes classically thought to have different embryological origins. anterior lobe (adenohypophysis) is derived from Rathke’s pouch, an upward growth of the primitive oral cavity which eventually becomes detached, while posterior (neurohypophysis) central nervous system and remains in direct connection with hypothalamus via stalk. In birds amphibia pouch appears develop ridge neural plate rather than endoderm gut, both thus having a common neuroectodermal origin (1, 2). This be proved mammals. fetal has intermediate arising wall pouch. fuse after birth, but small cysts may remain. Occasionally one enlarge sufficiently mimic expanding tumour, even stage causing apoplexy (3). pars tuberalis cuff cells, mainly gonadotrophs, extending up With age these undergo squamous metaplasia, not mistaken for metastatic carcinoma. Remnants can found along path migration most pharyngeal (4) roof nasopharynx. It contains all hormone producing cell types some functional interaction it. Ectopic adenomas arise here.