Conus arteriosus

The conus arteriosus (Infundibulum) is the smooth, muscular, funnel-shaped portion of the right ventricle that leads directly to the pulmonary valve. It is embryologically derived from the proximal segment of the outflow tract and is characterized by its distinct myocardial architecture and function. The conus is separated from the inflow tract by the crista supraventricularis, a muscular ridge unique to the right ventricle, and is responsible for channeling blood from the heavily trabeculated body of the right ventricle toward the pulmonary valve in a streamlined fashion.

The conus arteriosus and the right ventricular outflow tract (RVOT) are closely related but distinct anatomical entities in the heart: The right ventricular outflow tract (RVOT) is the region of blood outflow from the right ventricle between the supraventricular crest and the pulmonary valve that comprises of the conus arteriosus (infundibulum), ventricular septum and right ventricular free wall.