Vein skeleton of a Hydrangea leaf showing anastomoses of veins

An anastomosis (plural anastomoses) is a connection or opening between two things (especially cavities or passages) that are normally diverging or branching, such as between blood vessels, leaf veins, or streams. Such a connection may be normal (such as the foramen ovale in a fetus's heart) or abnormal (such as the patent foramen ovale in an adult's heart); it may be acquired (such as an arteriovenous fistula) or innate (such as the arteriovenous shunt of a metarteriole); and it may be natural (such as the aforementioned examples) or artificial (such as a surgical anastomosis). The reestablishment of an anastomosis that had become blocked is called a reanastomosis. Anastomoses that are abnormal, whether congenital or acquired, are often called fistulas.

The term is used in medicine, biology, mycology, geology, geography and architecture.


Anastomosis: medical or Modern Latin, from Greek ἀναστόμωσις, anastomosis, "outlet, opening", Gr ana- "up, on, upon", stoma "mouth", "to furnish with a mouth".[1] Thus the -stom- syllable is cognate with that of stoma in botany or stoma in medicine.

Other Languages
العربية: مفاغرة
беларуская: Анастамоз
català: Anastomosi
čeština: Anastomóza
español: Anastomosis
Esperanto: Anastomozo
فارسی: بازپیوندی
français: Anastomose
hrvatski: Anastomoza
Nederlands: Anastomose
norsk: Anastomose
oʻzbekcha/ўзбекча: Anastomoz
português: Anastomose
русский: Анастомоз
slovenščina: Anastomoza
Tagalog: Anastomosis
тоҷикӣ: Анастомоз