Features of Week 5
Primitive ventricle with partial muscular ventricular septum
Bulbus cordis and truncus arteriosus (which comprise the outflow tract)
Arioventricular septum and canals connect atria and ventricle.
Right and left conotruncal ridges as they arise from the walls of the outflow tract and form a spiral configuration.
- Their helical form reflects the flow of low oxygen and high oxygen blood through the heart.
- Swellings grow towards each other, pinching the single lumen.