osmoreceptor


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osmoreceptor

 [oz″mo-re-sep´tor]
1. any of a group of specialized neurons of the supraoptic nuclei of the thalamus that are stimulated by increased extracellular fluid osmolality to cause the release of antidiuretic hormone (ADH) from the posterior pituitary.

os·mo·re·cep·tor

(oz'mō-rē-sep'tŏr, -tōr),
1. A receptor in the central nervous system (probably the hypothalamus) that responds to changes in the osmotic pressure of the blood.
2. A receptor that receives olfactory stimuli.
Synonym(s): osmoceptor

osmoreceptor

/os·mo·re·cep·tor/ (oz″mo-re-sep´ter)
1. any of a group of specialized neurons in the hypothalamus that are stimulated by increased osmolality (chiefly, increased sodium concentration) of the extracellular fluid; their excitation promotes the release of antidiuretic hormone by the posterior pituitary.

osmoreceptor

[-risep′tər]
Etymology: Gk, ōsmos, impulse; L, recipere, to receive
1 a neuron in the hypothalamus that is sensitive to the relative fluid/solute concentration in the blood plasma and that regulates the secretion of antidiuretic hormone.
2 a receptor of smell stimuli.

os·mo·re·cep·tor

(oz'mō-rē-sep'tŏr)
1. A receptor in the central nervous system (probably the hypothalamus) that responds to changes in the osmotic pressure of the blood.
2. A receptor that receives olfactory stimuli.
[G. osmos, impulsion]

osmoreceptor

any of the group of structures sited in the HYPOTHALAMUS that respond to changes in osmotic pressure of the blood by means of neurohypophyseal antidiuretic hormone.

osmoreceptor

central nervous system receptor responding to changes in osmotic pressure of blood

osmoreceptor

1. a specialized sensory nerve ending sensitive to stimulation giving rise to the sensation of odors.
2. any of a group of specialized neurons of the supraoptic nuclei of the thalamus that are stimulated by increased extracellular fluid osmolality to cause the release of antidiuretic hormone (ADH) from the posterior pituitary.
References in periodicals archive ?
Again, it would seem unlikely that ANP would differentially affect thirst and AVP osmoreceptor neurons.
However, this center has a higher set point than the osmoreceptors and responds to osmolalities[greater than] 290 mmol/L.
Osmoreceptors in the hypothalamus respond when plasma osmolarity changes by as little as one per cent, first stimulating ADH release and then thirst.
Alternatively, mouthpart osmoreceptors might provide information about the chemical quality of prey items.
When plasma osmolality rises, it stimulates osmoreceptors located in the hypothalamus, which, in turn, sends signals to the vasopressin synthesizing cells located in the supraoptic and paraventricular nuclei of the hypothalamus.
Dry mucous membranes, hyperosmolality, and reduced plasma volume activate hypothalamic osmoreceptors, which trigger thirst and stimulate the secretion of ADH from the posterior pituitary.
Water-permeability of the late distal tubule is influenced by antidiuretic hormone (ADH), which is produced by the hypothalamus and released in response to input by systemic baroreceptors, osmoreceptors, and angiotensin II.
and the amphipod Gammarus oceanicus, and Tazaki and Tanino (1973) concluded that the antennae of the spiny lobster Panuliris japonicus have mechanoreceptors that also function as osmoreceptors.
This increase is sensed by osmoreceptors in the hypothalamus which responds by releasing AVP.
That is, the decreased venous return associated with positive pressure may stimulate osmoreceptors in the hypothalamus to increase ADH secretion, resulting in fluid retention.