Pericardial reflections

Anterior view:

Oblique & Transverse Sinuses of pericardium:

Transverse sinus from Echo: (Parasternal long axis view)

Figure from "Surgical Anatomy of the Heart - Wilcox, Cook, Anderson" 3rd ed. 2004.

Transverse sinus (Anatomic specimen):

Figure from "Surgical Anatomy of the Heart - Wilcox, Cook, Anderson" 3rd ed. 2004.