Primitive ventricle

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.

Embryonic ventricle
Tubular heart of human embryo of about fourteen days.
Interior of dorsal half of heart from a human embryo of about thirty days.
Details
Carnegie stage	11
Gives rise to	trabeculated parts of right ventricle, left ventricle
System	Cardiovascular system
Identifiers
Latin	ventriculus embryonicus
TE	ventricle_by_E5.11.1.3.1.0.2 E5.11.1.3.1.0.2
Anatomical terminology [edit on Wikidata]

The primitive ventricle becomes divided by the septum inferius which develops into the interventricular septum. 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

• 
  Heart showing expansion of the atria.

References

This article incorporates text in the public domain from page 512 of the 20th edition of Gray's Anatomy (1918)

External links

• Overview at mcgill.ca
• Description and diagram at umich.edu