ostium /os·ti·um/ (os´te-um) pl. os´tia [L.] an opening or orifice.os´tial
ostium.
ostium (
ˑ·stē·
m),
ostium
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.
os·ti·um ( s t - m)n. pl. os·ti·a (-t -) A small opening or orifice, as in a body organ. os ti·al adj. |
ostium.
See orifice.
ostium (
ˑ·stē·m),n an opening or passage.
ostium
pl. ostia [L.] a mouth or orifice; a general term to designate an opening into a tubular organ, or between two distinct body cavities. The names of most ostia are self-defining.
ostium abdominale
the fimbriated end of the uterine tube.
ostium cardiacum
the opening of the esophagus into the stomach.
coronary ostium
either of the two openings in the aortic sinuses which mark the origin of the (left and right) coronary arteries.
ostium ejaculatorium
the common orifice of the ductus deferens and the excretory duct of the seminal vesicle into the urethra.
ostium internum
ostium uterinum tubae.
ostium pharyngeum
the nasopharyngeal end of the auditory tube.
ostium primum
an opening in the lower portion of the membrane dividing the embryonic atria into right and left sides. Called also foramen primum. See also atrial septal defect.
ostium pulmonary vein
the opening of the pulmonary vein into the left atrium.
ostium ruminoreticulare
the opening between the rumen and the reticulum.
ostium secundum
an opening in the upper portion of the membrane dividing the embryonic atria into right and left sides, appearing later than the ostium primum. Called also foramen secundum. See also atrial septal defect.
tympanic ostium, ostium tympanicum
the opening of the auditory tube on the carotid wall of the tympanic cavity.
ostium uteri
the external opening of the cervix of the uterus into the vagina.
ostium uterinum tubae
the point where the cavity of the uterine tube becomes continuous with that of the uterus.
ostium vaginae
the external orifice of the vagina.
ostium
Plural, ostia Medtalk An opening, aperture
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