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| Bulbus cordis | ||
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| Heart showing expansion of the atria. | ||
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| 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 | |
When the developing heart assumes its S-shaped form, the bulbus cordis lies ventral to the primitive ventricle. 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.
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. |
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 As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.
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- This page was last modified on 12 March 2008, at 09:46.
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