Histological Study on the Arterial Wall of Göttingen Miniature Swine

In order to clarify the histological aspects of arterial walls of miniature swine, 41 arterial segments removed from each of 17 Göttingen miniature swines/csk at 6-12 months after birth were examined by light microscopy. Every segment was classified into three types—elastic, transitional, and muscular—according to its histological architecture. Each type was identified on the basis of relative volume and disposition of elastic tissues, collagenous fibers, and smooth muscles in three coats, Tunica intima, Tunica media, Tunica externa. The distribution of each type was demonstrated in a transition from the elastic to the muscular type. The transitional type was designated as a representative type of artery in transitional regions between elastic and muscular types and had some characteristic structures like a mixture of both of them. This type also had longer regions in the back district with the heart as the starting point, such as the Aorta abdominalis, than that of the front. Every artery belonging to the three types had some different structures at different levels, respectively. It was supposed that the histological arrangment of tissues in the walls of a vessel from various parts of the arterial tree would respond properly to the functional demand.