Distribution of capillaries and diffusion distances in guinea pig myocardium

A frequency distribution of distances from random points to the nearest capillary was generated from high-magnification photomicrographs of thin sections of the myocardium of seven guinea pigs. Individual mean capillary densities taken from regions viewed in transverse section ranged from approximately 1800 to 2500 capillaries/mm². Mean (\(\bar R\)) and maximal (R₉₅) diffusion distances measured by the closest individual method ranged from\(\bar R = 6.6 to 8.7 \mu m\) and R₉₅=11 to 18 μm. Further mathematical analysis of the frequency distributions of diffusion distances indicated that the capillaries of the myocardium are distributed in an ordered array.