There are four heart valves. All are one-way valves. Blood entering the heart first passes through the tricuspid valve and then the pulmonary valve. After returning from the lungs, the blood passes through the mitral (bicuspid) valve and exits via the aortic valve.
The mitral valve is between the left atrium and left ventricle. The aortic valve is between the left ventricle and the aorta.
Valve that guards the entrance to the aorta from the left ventricle. The aortic valve lies between the left ventricle and the aorta. The aortic valve has three cusps. During ventricular systole, pressure rises in the left ventricle. When the pressure in the left ventricle rises above the pressure in the aorta, the aortic valve opens, allowing blood to exit the left ventricle into the aorta. When ventricular systole ends, pressure in the left ventricle rapidly drops. When the pressure in the left ventricle decreases, the aortic pressure forces the aortic valve to close. The closure of the aortic valve contributes the A2 component of the second heart sound (S2).
The most common congenital abnormality of the heart is the bicuspid aortic valve. In this condition, instead of three cusps, the aortic valve has two cusps. This condition is often undiagnosed until the person develops calcific aortic stenosis. Aortic stenosis occurs in this condition usually in patients in their 40s or 50s, an average of over 10 years earlier than in people with normal aortic valves.
A substitute, mechanical or composed of tissue, for a cardiac valve.
The valves between the right atrium and right ventricle (tricuspid v. ) and the left atrium and left ventricle (mitral v. ).
A fold of mucous membrane sometimes occurring at the beginning of the nasolacrimal duct.
mitral v. - that between the left atrium and left ventricle, usually having two cusps (anterior and posterior).
A heart valve prosthesis consisting of a circular sewing ring to which are attached two semicircular occluding disks that swing open and closed to regulate blood flow.
An artificial cardiac valve composed of biological tissue, usually porcine.
A heart valve prosthesis comprising a sewing ring attached to a cage composed of curved struts that contains a free-floating ball.
The valves controlling the flow of blood through and from the heart.
Valve that at the entrance of the coronary sinus into the right atrium.
A cardiac valve having a cusp that has lost its normal support (as in ruptured chordae tendineae) and flutters in the blood stream.
Permanent transverse folds, usually numbering three, in the rectum. ileocecal valve , ileocolic valve that guarding the opening between the ileum and cecum.
A valve in the heart situated between the left atrium and the left ventricle that permits blood to flow from the left atrium into the left ventricle but not in the reverse direction.
The mitral valve has two flaps (cusps). It is called “mitral” because it looks like a bishop's miter or headdress. Also known as the bicuspid valve.
Vales that is at the entrance of the pulmonary trunk from the right ventricle.
One having semilunar cusps, i.e., the aortic and pulmonary valves; sometimes used to designate the semilunar cusps composing these valves.
coronary v. - that at the entrance of the coronary sinus into the right atrium.
A heart valve prosthesis consisting of a sewing ring and a valve housing containing a suspended disk that swings between open and closed positions.