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Comparative observations on intertubular lymphatics and the organization of the interstitial tissue of the mammalian testis.

The interstitial tissue of the testis has been studied in some 14 mammalian species and compared with respect to the abundance of Leydig cells and loose connective tissue, the degree of development and location of the interstitial lymphatics and their topographical relationship to the endocrine cells and to the seminiferous tubules. Marked differences were found among the species studied but in general they could be assigned to one of three patterns of organization: (1) with a relatively small of Leydig cells and very little connective tissue stroma but provided with extensive peritubular lymphatic sinusoids or lymph spaces which occupy a large part of the intertubu- lar area. which intertubular very