Final answer:
The membrane that covers the testicle and divides it into lobes is called the tunica albuginea. This tough layer of connective tissue forms septa creating lobules, each containing seminiferous tubules where sperm is produced.
Step-by-step explanation:
The membrane that covers the testicle and also divides the interior into lobes is called the tunica albuginea.
The testes, located within the scrotum, are surrounded by two distinct layers of protective connective tissue. The outer layer is the tunica vaginalis, which is a serous membrane with parietal and visceral layers. Beneath this layer lies the tunica albuginea, which is a dense layer of connective tissue.
The tunica albuginea not only covers the outside of the testis but also forms internal walls called septa, segmenting the testis into 300 to 400 lobules. Within these lobules are structures known as seminiferous tubules where sperm development takes place.