Bulbus cordis

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Bulbus cordis
Gray466.png
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.
Latin Bulbus cordis
Gray's p.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.

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This article incorporates text from a public domain edition of Gray's Anatomy.

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