12.11.2011
VALVES OF THE HEART
Posted on 7:38 PM by know about heart
The heart has two types of valve_
1) Atrioventricular valve
2) Semilunar valve.
1) Atrioventricular valve: Valves that situated between atria and ventricle is called atrioventricular valve.
Components of atrioventricular valve:
a) A fibrous ring
b) The cusps: It has two margin (an attached margin and a free margin) Two surface i) atrial ii) ventricular
c) chorodae tendineae: It has two types. True and false chorodae tendineae. True chorodae tendineae connect the free margins and ventricular surface of the cusps to apices of the papillary muscles.
d) Papillary muscle-It is conical shape. At the time of ventricular systole, pull the chordae tendinae. Atrioventricular valves get nutrition from the blood in the artery of the heart.
There are two types of atrioventricular valve_
A) Right atrioventricular valve: It lies in right side in between right atria and right ventricle. It has three cusps. Anterior, posterior and septal cusps. Anterior cusps are the largest and attached to the upper margin of the annulus. It is also known as tricuspid valve. It is situated is between right atrium and right ventricle.
B) Mitral valve: It is also known as bicuspid valve. This valve lies in the left side in between left atrium and right atrium.
It has two cusps,
1) Anterior cusp
2) Posterior cusp
Anterior cusp is large and lies between the mitral and aortic orifices.
2) Semilunar valve: It is called semilunar because there valves are semilunar in shape. The aortic valves and pulmonary valves are called semilunar valves. It is very interesting that pulmonary and aortic valves are similar to each other.
Function:
1) Valves maintain unidirectional flow of blood.
2) It prevents regurgitation of blood in opposite direction.
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