Aspect of the interior of the testicle observed with the objective of 40x. It is totality occupied by seminiferous tubules separated by connective tissue. We can see a group of interstitial cells, as well as the wall thickness and the lumen of a tubule. Details of the tubules wall (zones framed in red and blue) and the interstitial cells (zone framed in yellow) are observed at higher magnification in other microphotographies