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Microscopic studies on the arterial walls of main arteries supplying the mammary glands of guinea pig (Cavia porcellus) at different reproductive stages

A microscopic studies on the arterial wall of main arteries supplying the mammary glands of guinea pig at different reproductive stages was carried out by using a light microscope. The arterial segments from the ascending aorta to the mammary glands were classified into elastic, transitional and muscular types. The ascending aorta, aortic arch, brachiocephalic trunk, the subclavian, the thoracic, and abdominal aorta were elastic type. The subendothelial layer was present. The tunica media contained of well- defined elastic lamellae. The maximum numbers of elastic lamellae were recorded as 25-30, in the ascending aorta. The common iliac, the proximal and distal parts of the external iliac, and the proximal part of the femoral arteries were transitional type. The transitional type had the characteristics feature of both elastic and muscular types. The deep femoral, pudendoepigastric trunk, the external pudendal, the caudal superficial epigastric, and the caudal and cranial mammary arteries were muscular type. The tunica media was completely devoid of elastic lamellae. The reproductive stages did not affect the general histology of the large and medium size arteries. But the internal elastic membrane of the external pudendal, caudal superficial epigastric, and mammary arteries were wavy in the virgin stage. This wavy character was lost following pregnancy to the on the onset of lactation. It may be