ostium

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ostium

 [os´te-um] (L.)
an opening or orifice. adj., adj os´tial.
ostium abdomina´le the fimbriated end of the fallopian tube.
ostium cardi´acum the orifice between the esophagus and the stomach.
coronary ostium either of the two openings in the aortic sinuses that mark the origins of the left and right coronary arteries.
ostium inter´num ostium uterinum tubae.
ostium pharyn´geum the nasopharyngeal end of the eustachian tube.
ostium pri´mum an opening in the lower portion of the membrane dividing the embryonic heart into right and left sides. See also atrial septal defect and congenital heart defect.
ostium secun´dum an opening in the upper portion of the membrane dividing the embryonic heart into right and left sides, appearing later than the ostium primum. See also atrial septal defect and congenital heart defect.)
tympanic ostium (ostium tympa´nicum) the opening of the eustachian tube on the carotid wall of the tympanic cavity.
ostium u´teri the external opening of the cervix of the uterus into the vagina.
ostium uteri´num tu´bae the uterine end of the fallopian tube; the point where the cavity of the tube becomes continuous with that of the uterus.
ostium vagi´nae the external orifice of the vagina.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

os·ti·um

, pl.

os·ti·a

(os'tē-ŭm, -ă), [TA]
A small opening, especially one of entrance into a hollow organ or canal.
See also: orifice, opening, os, mouth (2).
[L. door, entrance, mouth]
Farlex Partner Medical Dictionary © Farlex 2012

ostium

(ŏs′tē-əm)
n. pl. os·tia (-tē-ə)
A small opening or orifice, as in a body organ or passage.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

ostium

Plural, ostia Medtalk An opening, aperture
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

os·ti·um

, pl. ostia (os'tē-ŭm, -ă) [TA]
A small opening, especially one that enters into a hollow organ or canal.
[L. door, entrance, mouth]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

ostium

An opening or mouth.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

ostium

any of numerous openings present in sponges through which water is drawn in.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

os·ti·um

, pl. ostia (os'tē-ŭm, -ă) [TA]
Small opening, especially one of entrance into a hollow organ or canal.
See also: orifice, mouth (2)
[L. door, entrance, mouth]
Medical Dictionary for the Dental Professions © Farlex 2012
References in periodicals archive ?
Hemodynamically significant CAAs are an anomalous location of coronary ostium at improper sinus with an interarterial course, an anomalous origin of a coronary artery from the pulmonary artery, a single coronary artery with an interarterial coursing major coronary artery, coronary ostial atresia and a congenital coronary artery fistula (20-22).
(5) documented that right coronary ostium tended to deviate more often towards Commissure I.
Inspection confirmed a right coronary sinus of Valsalva aneurysm involving the right coronary ostium. A bovine pericardial patch was placed between the aortic annulus and sinotubular junction excluding the aneurysm.
Levels of serotonin were evaluated in blood samples collected from the coronary ostium by using catheter without side holes.
As discussed in the study, this event is more prominent in the presence of a single coronary ostium giving two main coronary arteries (5).
Ishikawa et al (23) demonstrated that atherosclerosis ratio in the proximal segments of LAD (up to 2.5 cm away from the ostium) was significantly lower in cases with MB located within 5 cm from the left coronary ostium than in the corresponding segments of control group in an autopsy study.

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