By scanning electron microscopic observation of aorta and aortic branches, endothelial cells of 25 fetuses 2 to 10 months old,we found that the cells were spindle-shaped and long spindle-shaped in thoracic aorta and abdominal aorta,aortic arch cells were shorter and their nuclei were protrusive,the shape and arrangement as well as lesion were greatly different at the places between branches of bra-chiocephalic trunk,left carotid artery and left subclavian artery,and these between both intersegmental ar...
