Posted by Dr. Lazarus on August 21, 2011 at 12:20:38:
1.The primitive atrium is distinguishable as the smooth wall portion of the atria in the adult heart while the primitive ventricle is visible as trabeculae carneae in the adult
a.The smooth wall portion is the truncus arteriosus. This illustrates the understanding that the adult heart requires absorption of vascular supply and inflow and outflow tracts
2.From the right atria, the embryological remnant visible through the fossa ovalis is the septum primum
3.The myocardium of the heart is developed from lateral plate mesoderm and is specifically the somatopleuric (parietal) layer of lateral plate mesoderm
4.The pulmonary ligament is the location at which the parietal and visceral layers of the lateral plate mesoderm meet before reflecting on the body wall and gut tube endoderm, respectively
5.The transverse pericardial sinus is the location wherein the dorsal mesocardium brokedown and as a result permitted septation of the inflow and outflow tracts of the hearts
6.The interventricular septum, the endocardial cushions and the ductus arteriosus are directly involved with separation of the right and left ventricle
7.During development, the ductus arteriosus, which connects the future ascending aorta and pulmonary arteries, prevents the left recurrent laryngeal nerve from ascending into the neck as the right recurrent laryngeal nerve ascends