Heart Parts Flashcards
Coronary sulcus
Groove between atria and ventricles
Interventricular sulcus
Groove between ventricles
Interatrial and interventricular septum
Muscular and membranous. Separation atria/ventricles.
Crista Terminalis
Ridge separating smooth and rough RA.
Pectinate Muscles
Comb-like muscular ridges wall of part of the RA and in the left auricle.
Fossa Ovalis
Oval shaped depression on the interatrial septum of RA. Marks foramen ovale.
Tricuspid Valve
RA RV
Trabeculae Carneae
Muscular Bundles on the wall of the ventricles.
Papillary Muscles
Muscles attached to the atrioventricular valve cusps via chordae tendineae. They hold the valve closed when the ventricle contracts. Prevent backflow. Do not contract to open the valve.
Septomarginal Trabecula (Moderator Band)
Band of muscle containing connective tissue connecting the interventricular septum to the anterior papillary muscle and the anterior wall of the RV.
Conus arteriosus (Infundibulum)
The smooth outflow tract of the RV leading up to the pulmonary valve.
Pulmonary (Semilunar) Valve
Between the conus arteriosus and the pulmonary trunk. Three cup-like cusps. Each cusp has a central thickening called a nodule that is important for valve closure. Passively open by blood flow. When the ventricle relaxes, blood falls back down the outflow tract and collects in the sinuses of the semilunar valve. As the sinuses fill, the nodules of the three cusps meet and form the shape of an inverted pyramid; this prevents the cusps from descending further and keeps the valves closed.
Valve of Foramen Ovale
Piece of tissue on the interatrial septum of the LA that is a remnant of the primitive interatrial septum in the embryo. Usually it closes.
Bicuspid Valve
LA and LV atrioventricular valve. Bishop’s mitre. Two cusps.
Chordae Tendineae
Attaches muscle to valve.