Question

The tunica albuginea is a connective tissue layer in the wall of testes, which divides testicular spaces into X compartments called testicular lobules. Each lobule contains Y highly folded seminiferous tubules in which spermatogenesis occurs.
Choose the option which correctly fills blanks X and Y.

• A. X: 50–100; Y: 3–5
• B. X: 200–250; Y: 1–3
• C. X: 300–400; Y: 1–2
• D. X: 200–250; Y: 7–10

Answer 1

Answer: (B)

In adults, each oval-shaped testis is covered by a dense covering. Each testis has three-layered coverings:
1) Tunica vaginalis: It is the outermost layer and is further divided into the parietal layer which lines the cavity of the scrotum and a visceral layer that covers tunica albuginea.
2) Tunica albuginea: It is a tough capsule of collagenous connective tissue. The band of tissue that connects testis to the inferior part of scrotal sac is called gubernaculum. Each testis has about 250 compartments called testicular lobules which are formed due to inward growth of tunica albuginea called septa. Each of these compartments contain highly coiled 1-3 tubules called seminiferous tubules. Hence in each testis, a total of about 750 seminiferous tubules which are the site of spermatogenesis.
3) Tunica vasculosa: It is the tunica that covers the testes and facilitates blood supply.