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supraopticohypophysial tract


Definition: a bundle of unmyelinated fibers originating from all cells of the supraoptic nucleus and an estimated 20% of those of the paraventricular nucleus of the hypothalamus, which extend through the infundibulum and pituitary stalk to their endings in the posterior lobe of the hypophysis; the fibers convey neurosecretory substances, vasopressin and oxytocin, which are stored in (and can be released into the circulating blood from) their terminals.

Synonym(s): hypothalamohypophysial tractTA, tractus supraopticohypophysialisTA

See Also: pituitary gland, neurosecretion

Further information

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.