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Conus arteriosus

The conus arteriosus (infundibulum) forms the cone-shaped outflow tract of the right ventricle. It is located between the region of the right ventricle and pulmonary trunk and is characterized by its smooth walls which lack trabeculae. Separating the trabeculae carnae of the inflow part of the right ventricle from the conus arteriosus is a muscular ridge known as the supraventricular crest.

The conus arteriosus consists of a thin layer of cardiac muscle which overlies an elastic fibrous coat and therefore acts as a support structure for the pulmonary valve (located at the root of the pulmonary trunk). Beyond the pulmonary valve, the conus arteriosus continues as the pulmonary trunk and therefore functions to transport deoxygenated blood from the right ventricle to the pulmonary trunk and onto the lungs.

Terminology English: Conus arteriosus
Latin: Conus arteriosus
Definition The smooth walled outflow tract of the right ventricle located between the right ventricle and pulmonary trunk
Function Acts as a support structure for the pulmonary valve and is the origin point for the pulmonary trunk; transports deoxygenated blood from the right ventricle to the pulmonary trunk

Learn more about the features of the right atrium and ventricle of the heart in the study unit below.

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