The tunica albuginea is a tough, fibrous layer of connective tissue that surrounds certain organs in the body, including the testes and ovaries. In males, it encases the testes and helps maintain their shape while also playing a role in sperm production. In females, the tunica albuginea surrounds the ovaries, providing structural support. This layer is important for protecting the underlying tissues and organs, as well as facilitating the proper functioning of the reproductive system. Its name, which means "white coat" in Latin, reflects its dense and opaque appearance.