MICROANATOMY

Detailed explanation-1: -Oxygen-rich blood flows from the lungs back into the left atrium (LA), or the left upper chamber of the heart, through four pulmonary veins. Oxygen-rich blood then flows through the mitral valve (MV) into the left ventricle (LV), or the left lower chamber.

Detailed explanation-2: -Their pulmonary veins may drain directly into their right atrium, or they may drain into other veins that connect with their right atrium. Either way, oxygen-rich blood that should enter the left side of their heart instead mixes with oxygen-poor blood on the right side of their heart.

Detailed explanation-3: -The lung veins sometimes referred to as the pulmonary veins, are blood vessels that transfer freshly oxygenated blood from the lungs to the left atria of the heart.

Detailed explanation-4: -The pulmonary veins are the veins that transfer oxygenated blood from the lungs to the heart. The largest pulmonary veins are the four main pulmonary veins, two from each lung that drain into the left atrium of the heart. The pulmonary veins are part of the pulmonary circulation.

Detailed explanation-5: -Normal anatomy consists of four pulmonary veins in number, two for each lung and opened individually into the left atrium. The right superior pulmonary vein drains blood from right superior and right middle lobes.