Table 2.03 - Internal Specializations of the Embryonic Heart:

partitioning of common atrium into Right & Left chambers

separation of ventricle into Right & Left chambers

absorption of sinus venosus into wall of R atrium (pacemaker)

merging of part of bulbus into RV

longitudinal division of bulbus and truncus into aorta and pulmonary artery

formation of cardiac valves

histological differentiation of cardiac wall