The primitive ventricle or embryonic ventricle of the developing heart, together with the
bulbus cordis that lies in front of it, gives rise to the left and right
ventricles. The primitive ventricle provides the trabeculated parts of the walls, and the bulbus cordis the smooth parts.
The primitive ventricle becomes divided by the
septum inferius which develops into the
interventricular septum
The interventricular septum (IVS, or ventricular septum, or during development septum inferius) is the stout wall separating the ventricles, the lower chambers of the heart, from one another.
The ventricular septum is directed obliquely backwar ...
. The septum grows upward from the lower part of the ventricle, at a position marked on the heart's surface by a furrow.
Its dorsal part increases more rapidly than its ventral portion, and fuses with the dorsal part of the
septum intermedium.
For a time an
interventricular foramen exists above its ventral portion, but this foramen is ultimately closed by the fusion of the
aortic septum with the ventricular septum.
Additional images
File:Gray466.png, Heart showing expansion of the atria.
References
External links
Overview at mcgill.ca
Embryology of cardiovascular system
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