About the partitioning of primordial ventricle, which ones are right( )
A.
Interventricular septum includes muscular and membranous part
B.
Membranous part is thin, while muscular part is thick
C.
bulbar ridges participate in interventricular foramen' closure
D.
interventricular foramen between the muscular inerventricular septum and endocardial cushions exists short period
E.
the membranous part of IV septum forms earlier that the muscular part