View source for Ostium

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==Overview==
An '''ostium''' is a small opening or orifice, as in a body organ or passage.

==Anatomy==
*[[Ostium of Fallopian tube]].
*[[Ostium primum]] or [[foramen ovale]] (ostium secundum) of the developing [[heart]].
*[[Ostium maxillare]] of the Maxillary Sinus
* Ostium of [[uterus]]
* [[Vagina|Ostium vaginae]] (vaginal orifice)
* [[Coronary arteries|Coronary]] ostium (Opening of coronary arteries at root of aorta, superior to aortic valve)

==Ostial Disease==
Ostial disease refer to diseases involving the ostium of a body organ, passage or vessel.  In particular, ostial stenosis is a narrowing in a ostium. It can refer to:
* [[Coronary ostial stenosis]]
* Renal ostial stenosis


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