orifice (or´i-fis)

Any aperture or opening.orificium [NA]; [L. orificium]
anal o. anus
aortic o. the opening from the left ventricle into the ascending aorta; it is guarded by the aortic valve.ostium aortae [NA], aortic ostium;
cardiac o. the trumpet-shaped opening of the esophagus into the stomach.ostium cardiacum [NA], cardiac opening, esophagogastric o;
esophagogastric o. cardiac o
o. of external acoustic meatus opening of external acoustic meatus
external urethral o. 1. the slitlike opening of the urethra in the glans penis; 2. the external orifice of the urethra (in the female) in the vestibule, usually upon a slight elevation, the papilla urethrae.ostium urethrae externum [NA], external opening of urethra, meatus urinarius, orificium urethrae externum;
gastroduodenal o. pyloric o
golf-hole ureteral o. a retracted funnel-shaped condition of the ureteral o. in the wall of the bladder, due often to tuberculosis or a secondary sclerosis of the ureter.
ileocecal o. the opening of the terminal ileum into the large intestine at the transition between the cecum and the ascending colon.ostium ileocecale [NA], ileocecal opening;
o. of inferior vena cava opening of inferior vena cava
o. of internal acoustic meatus opening of internal acoustic meatus
internal urethral o. the internal opening or orifice of the urethra, at the anterior and inferior angle of the trigone.ostium urethrae internum [NA], internal urethral opening;
mitral o. an atrioventricular opening which leads from the left atrium into the left ventricle of the heart.ostium atrioventriculare sinistrum [NA], ostium arteriosum;
pulmonary o. opening of pulmonary trunk
pyloric o. the opening between the stomach and the superior part of the duodenum.ostium pyloricum [NA], gastroduodenal o;
root canal o. an opening in the pulp chamber leading to the root canal.
o. of superior vena cava opening of superior vena cava
tricuspid o. an atrioventricular opening which leads from the right atrium into the right ventricle of the heart.ostium atrioventriculare dextrum [NA], ostium venosum cordis;
ureteric o. the opening of the ureter in the bladder, situated one at each lateral angle of the trigone; wide gaping of the o. usually indicates vesicoureteral reflux.ostium ureteris [NA], orificium ureteris, ureteral meatus, ureteral opening;
vaginal o. the narrowest portion of the canal, in the floor of the vestibule posterior to the urethral orifice.ostium vaginae [NA], orificium vaginae, vaginal opening;


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