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BLOOD‐TESTIS BARRIER: Maintained Function of Inter‐Sertoli Cell Junctions in Experimental Cryptorchidism in the Rat, as Judged by a Simple Lanthanum‐Immersion Technique

In order to elucidate the mechanisms behind the deleterious effects on the germinal epithelium of experimental cryptorchidism the hypothesis that a leaking blood‐testis barrier is the cause of the damage was tested. The permeability of the specialized inter‐ Sertoli cell junctions to lanthanum after experimental cryptorchidism for 0.5 to 12 days was studied in the rat. In none of the time periods studied lanthanum had penetrated beyond the inter‐Sertoli cell junctions. A simple lanthanum immersion technique was used. Testes of 15‐days old rats (before the development of the barrier) were used as a positive control of the method, and in these testes lanthanum had penetrated up to the future lumen.