Valves of the Heart Flashcards
Right atrio-ventricular (tricuspid) valves has
3-cusps (anterior, posterior, & septal or medial)
tricuspid) valve
The atrial surface of the cusps are
smooth
tricuspid) valve
ventricular surfaces give attachment to
the chordae tendineae.
(tricuspid) valve The base of each cusp is secured to
the fibrous ring that surrounds the atrioventricular orifice.
tricuspid) valve
fibrous ring helps to
maintain the shape of the opening
tricuspid) valve
Atrioventricular orifice
About one inch wide, admitting tips of 3 fingers
Pulmonary Valve Surrounded by
fibrous ring which gives attachment to the cusps of the pulmonary valve.
Pulmonary Valve is formed of
3 semilunar cusps (Rt, Lt, & anterior)
Pulmonary Valve اشي مميز
No chordae tendineae or papillary muscles are attached to these cusps
Pulmonary Valve the semilunar cusp function
After ventricular contraction, the recoil of
blood fills these pulmonary sinuses and forces the cusps closed. This prevents blood in the pulmonary trunk from refilling the right ventricle.
The open mouths of the cusps are directed
upward into the pulmonary trunk.
The free superior edge of each cusp has
Nodule of the semilunar cusp
Lunula of the semilunar cusp
Nodule of the semilunar cusp
Middle, thickened portion
Lunula of the semilunar cusp
A thin lateral portion
Basis for Naming Cusps of the Aortic and Pulmonary Valves
truncus arteriosus has four cusps →truncus arteriosus divides into two vessels, each with its own three-cusp valve (pulmonary and aortic)→The heart undergoes partial rotation so that its apex becomes directed to the left, resulting in the arrangement of cusps