Disruption of Sertoli cell tight junctions would primarily alter the environment of developing germ cells inside which structure?

• A. Interstitial tissue
• B. Tubular lumen
• C. Blood vessels
• D. Scrotal skin

Answer: (B)

Sertoli cells create tight junctions that form the blood-testis barrier, dividing the seminiferous tubule into a basal compartment and an adluminal compartment. This barrier establishes a specialized, protected environment for developing germ cells as they progress through meiosis and maturation.

If those tight junctions are disrupted, the adluminal (within the seminiferous tubule) environment would be altered because substances from the blood/interstitial fluid could diffuse into the tubule and affect germ cell development. The space that germ cells interact with as they mature is the interior of the seminiferous tubule, i.e., the tubular lumen, so changes would primarily impact that environment.

The other options refer to tissues not directly housing the developing germ cells within the seminiferous tubule, so they aren’t the primary environment affected by loss of the Sertoli cell barrier.