Histologically, the decidua capsularis is composed of large, polygonal decidual cells that are rich in cytoplasm. These cells are characterized by the presence of abundant glycogen and lipid droplets. The extracellular matrix is also modified, with increased deposition of fibronectin and laminin, which are crucial for the structural integrity and function of the decidua. Additionally, the decidua capsularis is highly vascularized, containing numerous capillaries that provide nutrients and oxygen to the embryo.
