Bulbus cordis
Heart showing expansion of the atria.
Diagrams to illustrate the transformation of the bulbus cordis. (Keith.) Ao. Truncus arteriosus. Au. Atrium. B. Bulbus cordis. RV. Right ventricle. LV. Left ventricle. P. Pulmonary artery.
Gray's	subject #135 513
Carnegie stage	9
Gives rise to	smooth parts of right ventricle, left ventricle

The bulbus cordis (also known as the conotruncus) lies ventral to the primitive ventricle after the developing heart assumes its S-shaped form. Together, the bulbus cordis and the primitive ventricle give rise to the ventricle of the formed heart.

The adjacent walls of the bulbus cordis and ventricle approximate, fuse, and finally disappear, and the bulbus cordis now communicates freely with the right ventricle, while the junction of the bulbus with the truncus arteriosus is brought directly ventral to and applied to the atrial canal.

By the upgrowth of the ventricular septum the bulbus cordis is in great measure separated from the left ventricle, but remains an integral part of the right ventricle, of which it forms the infundibulum.

[edit] Additional images

Head of chick embryo of about thirty-eight hours’ incubation, viewed from the ventral surface. X 26

Diagram to illustrate the simple tubular condition of the heart.

Heart of human embryo of about fourteen days.

Human embryo about fifteen days old. Brain and heart represented from right side. Digestive tube and yolk sac in median section.

[edit] External links

• Embryology at Temple Heart98/heart97b/sld023
• cardev-017 — Embryology at UNC
• MedEd at Loyola GrossAnatomy/thorax0/Heart_Development/AtrioVent.html

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 As such, some of the information contained within it may be outdated.

v • d • e Prenatal development/Mammalian development of circulatory system (GA 5) Vascular Blood island Development of arteries Dorsal aorta · Aortic arches Development of veins Cardinal veins · Ducts of Cuvier Fetal circulation umbilical cord: Umbilical vein → Ductus venosus → Inferior vena cava → Heart → Pulmonary artery → Ductus arteriosus → Umbilical artery yolk sac: Vitelline veins · Vitelline arteries Heart development Primitive heart tube Truncus arteriosus · Bulbus cordis · Primitive ventricle · Primitive atrium · Sinus venosus Septa/ostia Endocardial cushions/Septum intermedium · Ostium primum · Septum primum (Ostium secundum) · Septum secundum (Foramen ovale) · Aorticopulmonary septum Other Atrial canal heart navs: anat/physio/dev, noncongen/congen/neoplasia, symptoms+signs/eponymous, proc

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