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As ostium (lat. "Input", plural Ostia or orifices ) is in the anatomy of the opening of the hollow organ , respectively. The term is used both for openings into another organ (e.g. the opening of the left ventricle of the heart towards the aorta - ostium aortae ) and for openings to the outside world (e.g. the vaginal opening - ostium vaginae).


  • Peter Reuter: Springer Lexicon Medicine. Springer, Berlin a. a. 2004, ISBN 3-540-20412-1 , pp. 1598-1599.