The primitive ventricle or embryonic ventricle of the developing heart, together with the
bulbus cordis
The bulbus cordis (the bulb of the heart) is a part of the heart development, developing heart that lies ventral to the primitive ventricle after the heart assumes its S-shaped form. The superior end of the bulbus cordis is also called the conotrun ...
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
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 ...
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
Endocardial cushions project into the atrial canal
The proper development of the atrioventricular canal into its prospective components (The heart septum and associated Heart valve, valves) to create a clear division between the four compartments ...
.
For a time an
interventricular foramen exists above its ventral portion, but this foramen is ultimately closed by the fusion of the
aortic septum
The aorticopulmonary septum is developmentally formed from neural crest, specifically the cardiac
neural crest, and actively separates the aorta and pulmonary arteries and fuses with the interventricular septum within the heart during heart develop ...
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
{{developmental-biology-stub