Constant position of the superficial cerebral veins of the rat: a quantitative analysis.

The normal anatomical position of the point of junction of the superficial cerebral veins with the superior sagittal and transverse sinuses of the rat was studied with an analytical mathematical method. There were eight fixed veins, each characterized by a constant point of juncture having minimal variance. The findings indicate that the points of juncture between large veins and sinuses are developmentally fixed and that there is a definite order in the number and the territories of the large veins.