Cardiac anatomy from right to left

Pulmonary valve

Next, blood runs towards the pulmonary valve - first entering the smooth, muscular infundibulum of the right ventricle.
The pulmonary valve has three cusps, and is separated from the tricuspid valve by a thick muscle known as the crista supraventricularis (blue arrow in the image below).
This differs from the left ventricular outflow tract, where the mitral and aortic valves lie side by side. 

Reconstruction showing the tricuspid (TV) and pulmonary (PV) valves as well as the cavity of the right ventricle (RV). The blue arrow indicates the crista supraventricularis