Study of renal artery and abdominal aorta in adult male dog

There has been no report about comparison of the abdominal aorta and renal artery in the adult male dog. So I decided to compare these two arteries in the adult dog. Six normal adult male dogs were studied. The specimens were processed in the routine way for electron microscopy. It was established that the only cell type Found in the tunica intima was endothelium in both abdominal aorta and renal artery. In the abdominal aorta the internal elastic membrane was cleaved in two layers and between them the collagen fibers were found. In the renal artery, endothelial cells attached directly to the internal elastic membrane and in some place the internal elastic membrane interrupted for as much as a few microns. The only cell type was found in the abdominal aorta and renal artery tunica media was smooth muscle cells. There were more dense bodies in the renal artery smooth muscle cells compares with the abdominal aorta. In the abdominal aorta tunica media, it was observed layers of smooth muscle cells that in contrast with the renal artery, in the extracellular space more elastic fibers were present in a continuous arrangement. The adventitia of the abdominal aorta and renal artery was consisting of scattered fibroblasts among the bundles of collagen and elastic fibers. In the tunica adventitia of the abdominal aorta more collagen fibers and in the renal artery adventitia more elastic fibers were found.