An ostium (plural 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) Orifice of the uterus may refer to:
* External orifice of the uterus
* Internal orifice of the uterus
Internal may refer to:
*Internality as a concept in behavioural economics
*Neijia, internal styles of Chinese martial arts
*Neigong or "internal ...
*
Ostium primum of the developing heart
* Ostium secundum (
foramen ovale There are multiple structures in the human body with the name foramen ovale (plural: ''foramina ovalia''; Latin for "oval hole"):
* Foramen ovale (heart), in the fetal heart, a shunt from the right atrium to left atrium
* Foramen ovale (skull), at ...
) of the developing heart
*
Ostium maxillare
Below the bulla ethmoidalis, and partly hidden by the inferior end of the uncinate process of ethmoid bone, is the maxillary hiatus (or ostium maxillare, or maxillary sinus ostium, or maxillary ostium, or opening from the maxillary sinus); in a fro ...
of the maxillary sinus
*
Ostium vaginae (vaginal orifice)
* Coronary ostium – opening of
coronary arteries at root of
aorta, superior to
aortic valve
*
Sinus ostium
The human nose is the most protruding part of the face. It bears the nostrils and is the first organ of the respiratory system. It is also the principal organ in the olfactory system. The shape of the nose is determined by the nasal bones a ...
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
*
*
Pore (disambiguation)
*
Foramen
*
Ostiole
An ''ostiole'' is a small hole or opening through which algae or fungi release their mature spores.
The word is a diminutive of "ostium", "opening".
The term is also used in higher plants, for example to denote the opening of the involuted ...
{{set index article