neurohypophysis (redirected from neurohypophysial)

neurohypophysis /neu·ro·hy·poph·y·sis/ (noor″o-hi-pof´ĭ-sis) the posterior (or neural) lobe of the pituitary gland, which stores oxytocin and vasopressin.neurohypophys´ial

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neu·ro·hy·poph·y·sis (nr-h-pf-ss, -h-)

n. pl. neu·ro·hy·poph·y·ses (-sz)

The posterior portion of the pituitary gland, having a rich supply of nerve fibers and releasing oxytocin and vasopressin. Also called posterior lobe of hypophysis.

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neuro·hypo·physe·al, neuro·hypo·physi·al (-hp-fz-l, -hp-, -h-pf-sl) adj.

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neurohypophysis

[-hīpof′isis]

Etymology: Gk, neuron + hypo, under, phyein, to grow

the posterior lobe of the pituitary gland that is the release point of antidiuretic hormone (ADH) and oxytocin. Nervous stimulation from the hypothalamus controls the release of the substances into the blood. When stimulated by the hypothalamus, the neurohypophysis releases ADH by an increase in the osmotic pressure of extracellular fluid in the body. The hormone acts on the cells in the distal and collecting tubules of the kidneys, making them more permeable to water and thus reducing the volume of urine. The neurohypophysis releases oxytocin under appropriate stimulation from the hypothalamus. Oxytocin produces powerful contractions of the pregnant uterus and causes milk to flow from lactating breasts. Stimulation of the nipples of the breast by a nursing infant triggers the release of this hormone. Also called posterior pituitary gland. Compare adenohypophysis.

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neurohypophysis [noor″o-hi-pof………´…ĭ-sis]

the posterior lobe of the pituitary gland. adj., adj neurohypophys´eal.

The neurohypophysis (posterior pituitary gland). From Applegate, 2000.

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neurohypophysis

the posterior lobe of the pituitary gland. It stores and secretes two hormones, oxytocin and antidiuretic hormone (vasopressin), which are released in response to neural stimulation.