PATHOLOGY

Detailed explanation-1: -Normally, each pulmonary vein connects directly with your left atrium. In that case, there are four ostia (openings) in your left atrium, one for each of your pulmonary veins. Oxygen-rich blood travels through these openings and into your left atrium.

Detailed explanation-2: -There are 4 total pulmonary veins-with 2 pulmonary veins coming from each lung, left and right-that empty into the left atrium of the heart. Two pulmonary veins emerge from the hilus of each lung, and each pulmonary vein receives blood from 3-4 bronchial veins apiece before draining into the left atrium.

Detailed explanation-3: -: a vein that returns oxygen-rich blood from the lungs to the left side of the heart.

Detailed explanation-4: -Also known as the obtuse marginal vein, the left marginal vein drains the myocardium of the left ventricle. [2] This vein travels along the left oblique marginal surface of the heart.