Left atrioventricular orifice
(Redirected from Ostium atrioventriculare sinistrum)
Left Atrioventricular Orifice[edit | edit source]
The Left Atrioventricular Orifice (also known as the Mitral Orifice or Bicuspid Orifice) is a vital component of the human heart. It is the opening that allows blood to flow from the left atrium to the left ventricle.
Structure[edit | edit source]
The Left Atrioventricular Orifice is guarded by the mitral valve, which prevents the backflow of blood into the left atrium when the left ventricle contracts. The orifice is approximately 4 to 6 cm in diameter, but its size can vary depending on the individual's heart size and health condition.
Function[edit | edit source]
The primary function of the Left Atrioventricular Orifice is to facilitate the flow of oxygenated blood from the left atrium to the left ventricle. This is a crucial step in the cardiac cycle, as the left ventricle then pumps this blood to the rest of the body via the aorta.
Clinical Significance[edit | edit source]
Abnormalities or diseases affecting the Left Atrioventricular Orifice can lead to serious health conditions. For instance, mitral stenosis is a condition where the orifice becomes narrow, restricting blood flow. Conversely, mitral regurgitation is a condition where the mitral valve does not close properly, leading to the backflow of blood.
See Also[edit | edit source]
References[edit | edit source]
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Contributors: Prab R. Tumpati, MD
