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(Circulation. 1972;46:375.)
© 1972 American Heart Association, Inc.

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The Conotruncus

I. Its Normal Inversion and Conus Absorption

DANIEL A. GOOR M.D.¹; R. DISCHE M.D.¹; C. WALTON LILLEHEI M.D.¹

¹ From the Departments of Surgery and Pathology, New York Hospital-Cornell University Medical College, New York, New York.

The processes which are involved in the development of the normal outflow tracts of the ventricles are the following: The ostium bulbar torsion accounts for the concordant flow between the ventricles and the proximal conuses. The leftward shift of the ostium bulbi accounts for the partial overriding of the aorta over the left ventricle. The truncal rotation accounts for the twisted relationships of the great vessels and for the definitive interrelationships of the semilunar valves. The aortic conus absorption accounts for the aorticomitral fibrous continuity. These processes are not necessarily linked to each other. In the normal, mature heart the conus is represented by the subpulmonary portion of the right ventricular outflow tract.

Key Words: Conus • Truncus • Heart embryology • Heart anatomy • Bulbus cordis

Submitted on August 31, 1971
Accepted on March 28, 1972

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