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1. the entrance or outlet of any body cavity.
aortic orifice the opening of the left ventricle into the aorta; called also aortic opening.
external urethral orifice urinary meatus.
internal urethral orifice the opening from the urinary bladder into the urethra at one corner of the trigone of the bladder.
left atrioventricular orifice (mitral orifice) the opening between the left atrium and ventricle of the heart.
pulmonary orifice (orifice of pulmonary trunk) the opening between the pulmonary trunk and the right ventricle of the heart; called also opening of pulmonary trunk.
right atrioventricular orifice (tricuspid orifice) the opening between the right atrium and ventricle of the heart.
ureteral orifice the opening of a ureter into the urinary bladder at one corner of the trigone of the bladder. Called also ureteral meatus.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
right atrioventricular orifice[TA]
an atrioventricular opening that leads from the right atrium into the right ventricle of the heart.
Farlex Partner Medical Dictionary © Farlex 2012
tri·cus·pid or·i·fice(trī-kŭs'pid ōr'i-fis)
An atrioventricular opening that leads from the right atrium into the right ventricle of the heart.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
Right atrioventricular cardiac aperture.
Medical Dictionary, © 2009 Farlex and Partners