Infundibulum (heart)

Infundibulum
Sternocostal surface of heart. (Infundibulum (Conus arteriosus) visible at top center.)
Details
Identifiers
Latin	Infundibulum
Dorlands /Elsevier	c_54/12257620
TA	A12.1.02.008
FMA	7216
*Anatomical terminology*

The infundibulum (also known as 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 trunk arises. It develops from the bulbus cordis.

A tendinous band, extends upward from the right atrioventricular fibrous ring and connects the posterior surface of the infundibulum to the aorta. The infundibulum 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.

References

This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)

Anatomy of the heart

General

Surface

Internal

atria interatrial septum pectinate muscles terminal sulcus ventricles interventricular septum trabeculae carneae chordae tendineae papillary muscle valves cusps atrioventricular septum
cardiac skeleton intervenous tubercle

Chambers

Right heart	(venae cavae, coronary sinus) → right atrium (atrial appendage, fossa ovalis, limbus of fossa ovalis, crista terminalis, valve of inferior vena cava, valve of coronary sinus) → tricuspid valve → right ventricle (infundibulum, 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)

Layers

Endocardium	heart valves
Myocardium	Conduction system cardiac pacemaker SA node AV node bundle of His bundle branches Purkinje fibers
Pericardial cavity	pericardial sinus
Pericardium	fibrous pericardium sternopericardial ligaments serous pericardium epicardium/visceral layer fold of left vena cava

Blood supply

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