**1.4 Left atrium and pulmonary veins**

The left atrium is located behind and to the left of the right atrium. The left atrium and pulmonary veins are structures located in the deepest layer of the heart.

*Molecular Histopathology and Cytopathology in Cardiovascular Diseases DOI: http://dx.doi.org/10.5772/intechopen.110503*

