4.心脏内部的分隔 4.1房室管的分隔:心内膜下组织→背、腹 内膜垫→融合→左、右房室管 Sup, endocardial nary channel Common cushion Aortic sac atrioventricular Right superior Aortic arches canal Aortic Left inferior Int endocardial Right dorsal conus swelling Left ventral Right conus swelling atrioventricular Bulboventricular Left lateral D Right lateral Left cushion Interventricular septum Inf. endocardial atrioventricular canal4. 心脏内部的分隔 4.1 房室管的分隔： 心内膜下组织 → 背、腹 心内膜垫 → 融合 → 左、右房室管