18. Valves and Fibrous Skeleton of Heart Flashcards
Identify 1 -> 4
- Pulmonary valve (Anterior, Right, and Left semilunar cusps)
- Aortic valve (Right, Left, and Posterior semilunar cusps)
- Left atrioventricular (mitral) valve (Anterior and Posterior cusps)
- Left fibrous ring (of left atrioventricular [mitral] valve)
Identify 5 -> 6
- Right fibrous trigone
- Left fibrous trigone
Identify 7 -> 8
- Right atrioventricular (tricuspid) valve (Anterior, Septal, and Posterior cusps)
- Membranous septum (Interventricular and Atrioventricular parts)
The 1st heart sound (“lub”) is caused by ___
closure of the tricuspid and mitral valves at the onset of ventricular systole.
The 2nd heart sound (“dub”) is caused by ___
closure of the aortic and pulmonary valves at the onset of ventricular diastole.
Describe The pulmonary valve. (valve type? How many cusps?)
The pulmonary valve is a semilunar valve with 3 cusps.
The pulmonary valve is best heard at where?
Through the stethoscope, this valve is best heard over the left 2nd intercostal space, just lateral to the sternum.
Describe The aortic valve. (valve type? How many cusps?)
The aortic valve also is a semilunar valve with 3 cusps.
The aortic valve is best heard at where?
Closure of this valve is best heard over the right 2nd intercostal space just lateral to the sternum.
Describe The mitral valve
The mitral (bicuspid, or left atrioventricular) valve has 2 cusps
The mitral valve is best heard at where?
Its closure at the onset of ventricular systole is best heard in the left 5th intercostal space, at the midclavicular line
Describe the tricuspid valve
The tricuspid (right atrioventricular) valve has 3 cusps.
The tricuspid valve is best heard at where?
Its sound is best heard over the lower portion of the body of the sternum.
The wall of the heart is composed principally of ___
cardiac muscle and a fibrous skeleton that provides attachment points for some of the cardiac muscle fibers and each heart valve.
