Arterial Variations in Man: Classification and Frequency

In textbooks on anatomy, radiology and stead of the normal one. An "accessory ar­ surgery only the "normal" arterial blood tery" is a second artery ip addition to the one normally present, without any specifi­ supply is usually described. This "nor­ mality", however, is sometimes found in cation of size being made. However, there less than 30% of all cases for some arteries, is no general agreement on whether minute but in over 95% for others. Rarely men­ vessels with very small diameters and hard­ tioned are deviations in the individual ar­ ly any significant blood flow should also be tery's origin, topographical localization and considered. the area it supplies. They can be classified The aims of this book were twofold: first, to into two groups: malformations and vari­ extract the frequency of arterial anomalies from the literature (often published in inac­ ations. Malformations often have a nega­ tive influence on the function of the organ cessible journals) and second, to classity under normal circumstances, e.g. if both these arteries by schematic outlines of the basic types.