An ostium (: ostia) in anatomy is a small opening or orifice.
Ostia, not as a plural, is also the name of a number of places.
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 Ostium (insect anatomy), of female Lepidoptera genitalia
See also
Pore (disambiguation) Foramen Ostiole