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:

• 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.

• Ostium (sponges), the pores of living sponges
• Ostia of female lepidoptera genitalia

• All pages with titles containing Ostium
• Pore (disambiguation)
• Foramen
• Ostiole

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