Posterior pituitary
The back portion of the pituitary, a small gland in the head called the master gland. The posterior pituitary secretes the hormone oxytocin which increases uterine contractions and antidiuretic hormone (ADH) which increases reabsorption of water by the tubules of the kidney. Underproduction of ADH results in a disorder called diabetes insipidus characterized by inability to concentrate the urine and, consequently, excess urination leading potentially to dehydration. The urine is "insipid" (overly dilute).

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posterior pituitary n
1) NEUROHYPOPHYSIS
2) an extract of the neurohypophysis of domesticated animals for medicinal use called also posterior pituitary extract

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1. neurohypophysis. 2. a powdered preparation of the dried neurohypophysis of certain food animals, having the pharmacological actions of its hormones, oxytocin and vasopressin; used mainly as an antidiuretic in the treatment of central diabetes insipidus, administered subcutaneously, by nasal inhalation, or by topical application to the nasal mucosa. It may be used to stimulate smooth muscle tissue, especially to produce vasoconstriction in the presence of hemorrhage.

Medical dictionary. 2011.

Look at other dictionaries:

  • Posterior pituitary — Pituitary gland. Posterior pituitary is in blue. Pars nervosa and infundibular stalk are not labeled, but pars nervosa is at bottom and infundibular stalk is at top.) …   Wikipedia

  • posterior pituitary — noun the posterior lobe of the pituitary body; primarily glandular in nature • Syn: ↑posterior pituitary gland, ↑neurohypophysis, ↑pars nervosa • Hypernyms: ↑endocrine gland, ↑endocrine, ↑ductless gland …   Useful english dictionary

  • posterior pituitary — poste′rior pitu′itary n. anat. the posterior region of the pituitary gland, which develops embryologically from the forebrain and secretes the hormones vasopressin and oxytocin Also called neurohypophysis …   From formal English to slang

  • posterior pituitary. — See under pituitary gland. * * * …   Universalium

  • posterior pituitary. — See under pituitary gland …   Useful english dictionary

  • posterior pituitary gland — n NEUROHYPOPHYSIS …   Medical dictionary

  • posterior pituitary gland — noun the posterior lobe of the pituitary body; primarily glandular in nature • Syn: ↑posterior pituitary, ↑neurohypophysis, ↑pars nervosa • Hypernyms: ↑endocrine gland, ↑endocrine, ↑ductless gland …   Useful english dictionary

  • posterior pituitary hormones — the hormones released from the neurohypophysis (posterior pituitary), which are formed in the neuronal cells of the hypothalamic nuclei and stored in nerve cell endings in the neurohypophysis. The principal ones are vasopressin and oxytocin.… …   Medical dictionary

  • posterior lobe of hypophysis — posterior pituitary lobe, posterior lobe of pituitary gland neurohypophysis …   Medical dictionary

  • pituitary gland — Anat. a small, somewhat cherry shaped double structure attached by a stalk to the base of the brain and constituting the master endocrine gland affecting all hormonal functions in the body, consisting of an anterior region (anterior pituitary or… …   Universalium

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