Oxytocin-the neurohypophysis (posterior pituitary) is derived from an evagination of diencephalic neurectoderm. this structure is responsible for releasing oxytocin and vasopressin to the general circulation. both hormones are synthesized in cellbodies contained within the hypothalamus. acth (choice a), prolactin (choice d), and tsh (choice e) are all synthesized and released by the anterior pituitary, or adenohypophysis, which is derived from an evagination of the ectoderm of rathkes pouch, a diverticulum of the primitive mouth. remnants of this pouch may give rise to a craniopharyngioma in later life. epinephrine