примеры использования
An ascending dissection occasionally can occlude the ostium of a coronary artery and lead to myocardial infarction.
The ostium leads to the second portion of the oviduct, the ampulla, which is the duct's dilated mid-portion where fertilization usually occurs.
Because of their lack of a continuous outer membrane and their lack of defined ostia , hexactinellids lack control over how much water passes through them.
For instance, many arthropods have lost extensive metamerism but still have remnants in the form of repeated organs (such as the limbs in cladocerans and spiders, or the heart ostia in a spider opisthosoma).
The latter arise from the paranasal sinuses and protrude into the nasopharynx through the sinus ostia .
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