The structural basis of the blood-testis barrier is

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The blood-testis barrier is formed by the tight junctions between sustentocytes (also known as Sertoli cells) in the seminiferous tubules. These tight junctions prevent the movement of larger molecules and immune cells from the bloodstream into the lumen of the tubules, thereby protecting developing sperm from potential immune attack. The basal lamina around the seminiferous tubules and the capillaries that supply them also play a role in supporting the barrier, but they are not the primary structural basis.

The Structural Basis of the Blood-Testis Barrier Is