Look up ostium in Wiktionary, the free dictionary.
An ostium (pl.: ostia) in anatomy is a small opening or orifice.
Ostium or ostia may refer to:
Human anatomy
- Ostium of fallopian tube
 - Ostium of the uterus (disambiguation)
 - Ostium primum of the developing heart
 - Ostium secundum (foramen ovale) of the developing heart
 - Ostium maxillare of the maxillary sinus
 - Ostium vaginae (vaginal orifice)
 - Coronary ostium – opening of coronary arteries at root of aorta, superior to aortic valve
 - Sinus ostium an opening that connects a sinus to the nasal cavity itself.
 
In other animals
- Ostium (sponges), the pores of living sponges
 - Ostia of female lepidoptera genitalia
 
See also
- All pages with titles containing Ostium
 - Pore (disambiguation)
 - Foramen
 - Ostiole
 
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