Final answer:
The tissue that lines the inside of the scrotum is called the tunica vaginalis. It is a serous membrane that protects the testes.
Step-by-step explanation:
The tissue that lines the inside of the scrotum is called the tunica vaginalis. It is a serous membrane that has both a parietal and a thin visceral layer. The tunica vaginalis is one of the two distinct protective connective tissue layers surrounding the testes, with the other layer being the tunica albuginea.