ostium /os·ti·um/ (os´te-um) pl. os´tia [L.] an opening or orifice.os´tial
ostium abdomina´le tu´bae uteri´nae the funnel-shaped opening where the uterine tube meets the abdominal cavity.
coronary ostium either of the two openings in the aortic sinus that mark the origin of the (left and right) coronary arteries.
ostium inter´num u´teri o. uterinum tubae uterinae.
ostium pharyn´geum tu´bae auditi´vae the pharyngeal opening of the auditory tube.
ostium pri´mum an opening in the lower portion of the membrane dividing the embryonic heart into right and left sides.
ostium secun´dum an opening high in the septum of the embryonic heart, approximately where the foramen ovale will later appear.
tympanic ostium , ostium tympa´nicum tu´bae auditi´vae the opening of the auditory tube on the carotid wall of the tympanic cavity.
ostium u´teri the external opening of the uterine cervix into the vagina.
ostium uteri´num tu´bae uteri´nae the point where the cavity of the uterine tube becomes continuous with that of the uterus.
ostium vagi´nae the external orifice of the vagina.
ostium ab·dom·i·na·le tu·bae u·ter·i·nae ( b-d m  -n  l t b yt-r n)n. The fimbriated or ovarian extremity of an oviduct. |
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