index-heart

Openings of pulmonary veins are areas where pulmonary veins open into the left atrium.

The sinus of pulmonary veins is the area that receives the pulmonary veins.

The smooth part of left atrium is the greater part of the smooth-walled atrial body is confluent with the pulmonary venous sinus.

The pectinate muscles of left atrium are raised muscular bands that are situated inside the left auricle.

The left auricle of the heart is an outpouching of the left atrium that is located in its upper part, in front of the left superior pulmonary vein. It has a narrow-base origin.