ostium


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Related to ostium: Ostium primum, Ostium secundum

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.

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]

ostium

(ŏs′tē-əm)
n. pl. os·tia (-tē-ə)
A small opening or orifice, as in a body organ or passage.

ostium

Plural, ostia Medtalk An opening, aperture

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]

ostium

An opening or mouth.

ostium

any of numerous openings present in sponges through which water is drawn in.

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]
References in periodicals archive ?
Generally, a single PV potential closely following or fused with an atrial potential in the ostium of the PVs is the most commonly observed pattern during SR [7].
Saremi et al found the distance between ostium of LCx and Left SANA ranged from 2 - 35 mm.
After the study work of 100 cadaveric human hearts, the different variations in ostium of RCA and LCA were came across.
Ostium location for bronchial arteries originating from the thoracic aorta and aortic arch was determined using the methodology by Battal et al.
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.
Adhesion may also form between the flaps of nasal mucosa, flaps of lacrimal sac and sometimes between the nasal mucosa at the margins of ostium and nasal septum if there is damage to the nasal mucosa covering the nasal septum.11 No intra operative complications were observed in our study.
All patients with isolated ASD (ostium secundum, ostium primum and sinus venosus with or without PAPVD) were included.
During balloon aortoplasty bulky leaflets may transiently occlude the LMCA ostium. This patient had enough coronary ostia to annulus diameter.
Single coronary ostium. In this rare anomaly only one coronary artery arises from a single ostium (0.0024% to 0.044% of the population).
In addition, its unique balloon characteristics were designed to allow full dilatation of the side branch ostium and reduce the risk of dissections and side branch injuries.
This patent and Acclarent's earlier 7,462,175 patent are directed to methods for treating a paranasal sinus ostium, such as the maxillary sinus ostium, either through the nostril or other routes.