The posterior pituitary is called the neurophypophysis because it is composed of neurofibers which are axons from neurons in the

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The posterior pituitary is called the neurophypophysis because it is composed of neurofibers which are axons from neurons in the hypothalamus There are two groups of neurons in the hypothalamus that secrete hormones the supraoptic nucleus and the paraventricular nucleus The axons from these nuclei travel through the infundibulum from the hypothalamus by way of the hypothalamohy pophyseal tract The supraoptic nucleus secrets the hormone antidiuretic hormone ADH and the paraventricular nucleus secretes oxytocin OT These two hormones are released in vesicles which travel down the axon tract by axonal transport to terminate in the posterior pituitary where they are stored Nerve impulses from the hypothalamus trigger their release by exocytosis Antidiuretic Hormone ADH Oxytocin OT

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