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ostium

A Dictionary of Zoology | 1999 | Copyright

ostium An opening, derived from the Latin word for a door or opening. In Porifera, one of the openings through which water is drawn into the body. In Arthropoda, one of the openings in the wall of the heart into the pericardial (blood-filled) sinus.

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MICHAEL ALLABY. "ostium." A Dictionary of Zoology. 1999. Encyclopedia.com. 9 Feb. 2010 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "ostium." A Dictionary of Zoology. 1999. Encyclopedia.com. (February 9, 2010). http://www.encyclopedia.com/doc/1O8-ostium.html

MICHAEL ALLABY. "ostium." A Dictionary of Zoology. 1999. Retrieved February 09, 2010 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O8-ostium.html

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Related newspaper, magazine, and trade journal articles from HighBeam Research

(Including press releases, facts, information, and biographies)

	Where is the ostium of the ethmoid bulla? Magazine article from: Ear, Nose and Throat Journal Yanagisawa, Eiji Joe, John K. Christmas, Dewey A. December 1, 1999 700+ words The natural ostium of the maxillary sinus opens into the floor of the ethmoid infundibulum. The ostium of the sphenoid sinus is in the sphenoethmoid recess, and the ostium of the posterior ethmoid sinus is in the superior meatus. The frontal...
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Related entries from encyclopedias, dictionaries, and thesauruses

	ostium Book article from: A Dictionary of Nursing ostium ( oss -tiŭm) n. (pl. ostia) (in anatomy) an opening. o. abdominale the opening of the Fallopian tube into the abdominal cavity.
	Salpingostomy Encyclopedia entry from: Gale Encyclopedia of Surgery: A Guide for Patients and Caregivers ...fluid, a salpingostomy may be performed to create a new tubal ostium (opening). Demographics Ectopic pregnancy occurs in approximately...tissue is folded over and stitched into place. The new hole, or ostium, replaces the normal opening of the fallopian tube through...
	porocyte Book article from: A Dictionary of Zoology porocyte In Porifera , a cell that guards the ostium . Each porocyte is tubular and extends from the external surface to the internal chamber of the sponge. The lumen of the tube forms the ostium, and the outer end of the cell can be closed or opened by contraction.
	Endoscopic Sinus Surgery Encyclopedia entry from: Gale Encyclopedia of Surgery: A Guide for Patients and Caregivers ...ethmoid air cells, to allow better ventilation, but leaves the bone covered with the mucous membrane. Following this step, the ostium located near the jaw is checked for obstruction and, if necessary, opened with a middle meatal antrostomy. This surgical...
	orifice Book article from: A Dictionary of Nursing orifice ( o -ri-fis) n. an opening in an anatomical part. See ostium .