Below, we review some of the microscopic examination methods. We have already dealt with the descriptions of the generally used experimental tools and methods. The spatial position, size, and structural relationships of a tissue or its components are most often studied on sections made in certain directions. First of all, there is a cross-section made in a plane perpendicular to the longitudinal axis of the organ to be examined (Fig. 9.1), as well as a radial (Fig. 9.2) passing through the longitudinal axis of the organ, and a tangential longitudinal section parallel to the longitudinal axis.