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2. Heart valve - Wikipedia

   en.wikipedia.org/wiki/Heart_valve

   Together, the valves determine the direction of blood flow through the heart. Heart valves are opened or closed by a difference in blood pressure on each side. [1] [2] [3] The mammalian heart has two atrioventricular valves separating the upper atria from the lower ventricles: the mitral valve in the left heart, and the tricuspid valve in

3. Mitral valve - Wikipedia

   en.wikipedia.org/wiki/Mitral_valve

   The mitral valve (/ ˈ m aɪ t r ə l / MY-trəl), also known as the bicuspid valve or left atrioventricular valve, is one of the four heart valves. It has two cusps or flaps and lies between the left atrium and the left ventricle of the heart. The heart valves are all one-way valves allowing blood flow in just one

4. Tricuspid valve - Wikipedia

   en.wikipedia.org/wiki/Tricuspid_valve

   The tricuspid valve, or right atrioventricular valve, is on the right dorsal side of the mammalian heart, at the superior portion of the right ventricle.The function of the valve is to allow blood to flow from the right atrium to the right ventricle during diastole, and to close to prevent backflow (regurgitation) from the right ventricle into the right atrium during right ventricular ...

5. Atrioventricular canal - Wikipedia

   en.wikipedia.org/wiki/Atrioventricular_canal

   Atrioventricular canal defect is a combination of abnormalities of the heart and is present at birth. There is a problem when there are holes present in the walls that separate chambers ( septa ), as well as when valves are incorrectly constructed.

6. Cardiac skeleton - Wikipedia

   en.wikipedia.org/wiki/Cardiac_skeleton

   The valve rings, central body, and skeleton of the heart consisting of collagen are impermeable to electrical propagation. The only channel allowed (barring accessory/rare preexcitation channels) through this collagen barrier is represented by a sinus that opens up to the atrioventricular node and exits to the bundle of His.

7. Endocardial cushions - Wikipedia

   en.wikipedia.org/wiki/Endocardial_cushions

   Endocardial cushions, or atrioventricular cushions, refer to a subset of cells in the development of the heart that play a vital role in the proper formation of the heart septa. They develop on the atrioventricular canal [2] and conotruncal region of the bulbus cordis. [3] During heart development, the heart starts out as a tube. As heart ...