Primitive ventricle
The embryonic ventricle or primitive ventricle of the developing heart gives rise to the trabeculated parts of the left and right ventricles
Ventricle (heart)
In the heart, a ventricle is one of two large chambers that collect and expel blood received from an atrium towards the peripheral beds within the body and lungs. The Atria primes the Pump...

. In contrast, the smooth parts of the left and right ventricles originate from the embryological bulbus cordis
Bulbus cordis
The bulbus cordis lies ventral to the primitive ventricle after the developing heart assumes its S-shaped form...


The primitive ventricle becomes divided by a septum
In anatomy, a septum is a wall, dividing a cavity or structure into smaller ones.-In human anatomy:...

, the septum inferius or ventricular septum, which grows upward from the lower part of the ventricle, its position being indicated on the surface of the heart by a furrow.

Its dorsal part increases more rapidly than its ventral portion, and fuses with the dorsal part of the septum intermedium
Septum intermedium
Endocardial cushions project into the atrial canal, and, meeting in the middle line, unite to form the septum intermedium which divides the canal into two channels, the future right and left atrioventricular orifices.-External links:*...


For a time an interventricular foramen exists above its ventral portion, but this foramen is ultimately closed by the fusion of the aortic septum
Aortic septum
In the developing heart, the truncus arteriosus and bulbus cordis are divided by the aortic septum. This makes its appearance in three portions....

with the ventricular septum.

External links

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