Conus arteriosus: Definition from Answers.com

Conus arteriosus

Sternocostal surface of heart. (Conus arteriosus visible at top center.)
Gray's	subject #138 531

The conus arteriosus is a conical pouch formed from the upper and left angle of the right ventricle in the chordate heart, from which the pulmonary artery arises.

A tendinous band, which may be named the tendon of the conus arteriosus, extends upward from the right atrioventricular fibrous ring and connects the posterior surface of the conus arteriosus to the aorta. The conus arteriosus is also called the infundibulum, and it is the entrance from the right ventricle into the pulmonary artery and pulmonary trunk. The wall of the infundibulum is smooth.

Additional images

Front view of human heart and lungs.

External links

-254803911 at GPnotebook
Conus+arteriosus at eMedicine Dictionary

This cardiovascular system article is a stub. You can help Wikipedia by expanding it.

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated.

Anatomy of torso, cardiovascular system: heart

Chambers

General	atria (interatrial septum, musculi pectinati) · ventricles (interventricular septum, trabeculae carneae, chordae tendineae, papillary muscle) · valves · cusps

Right heart	(vena cavae, coronary sinus) → right atrium (atrial appendage, fossa ovalis, limbus of fossa ovalis, crista terminalis, valve of the inferior vena cava, valve of the coronary sinus) → tricuspid valve → right ventricle (conus arteriosus, moderator band/septomarginal trabecula) → pulmonary valve → (pulmonary artery and pulmonary circulation)

Left heart	(pulmonary veins) → left atrium (atrial appendage) → mitral valve → left ventricle → aortic valve (aortic sinus) → (aorta and systemic circulation)

Surface regions

base · apex · grooves (coronary/atrioventricular, interatrial, anterior interventricula, posterior interventricular) · surfaces (sternocostal, diaphragmatic) · borders (right, left)

Layers

pericardium: fibrous pericardium · serous pericardium (pericardial cavity, epicardium/visceral layer) · pericardial sinus
myocardium · endocardium · cardiac skeleton (fibrous trigone, fibrous rings)

Conduction system

Cardiac pacemaker · SA node · AV node• bundle of His · Purkinje fibers

heart navs: anat/physio/dev, noncongen/congen/neoplasia, symptoms+signs/eponymous, proc

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