The conus cordis, a derivative of the bulbus cordis, contributes to which structures in the fully developed heart?
- A Trabeculated apical portions of both ventricles
- B Smooth-walled parts of both the right and left ventricles just below the semilunar valves ✓
- C Smooth part of the right atrium only
- D The entire interventricular septum
Correct answer: B. Smooth-walled parts of both the right and left ventricles just below the semilunar valves
Explanation
The heart tube has five regions. The bulbus cordis divides into the truncus arteriosus proximally continuous with the aorta and pulmonary trunk, the conus cordis, and the trabeculated part of the right ventricle. The conus cordis forms the smooth outflow regions of both ventricles, the conus arteriosus (infundibulum) of the right ventricle and the aortic vestibule of the left. The trabeculated parts come from the primitive ventricle and the bulbus cordis proper respectively.
Reference: Langman's Medical Embryology, 14th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.