The conus arteriosus, or infundibulum, is the smooth-walled, funnel-shaped outflow part of the right ventricle leading up to the pulmonary valve. It is separated from the trabeculated inflow part by a muscular ridge called the supraventricular crest. Externally it forms the upper left part of the front of the right ventricle.
| Location | Upper front of the right ventricle, beneath the pulmonary valve and to the left of the root of the aorta. |
|---|---|
| Parts |
|
| Blood Supply | Conus artery; Left anterior descending artery (conus branch) |
Channels blood smoothly from the right ventricle into the pulmonary trunk during systole.
Narrowing of the infundibulum is a key feature of tetralogy of Fallot. The right ventricular outflow tract is a common origin of benign ventricular ectopy and idiopathic ventricular tachycardia in people with structurally normal hearts, which may be noticed during exercise. It receives its own small conus artery, often from the right coronary artery.
Muscular narrowing of the outflow tract, usually congenital. It obstructs flow to the lungs and is part of tetralogy of Fallot.
A ventricular rhythm arising from the outflow tract in an otherwise normal heart. It is often triggered by exercise and can be treated with medication or ablation.
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