tunica albuginea tunica albuginea tunica albuginea may refer to: tunica albuginea (penis), the tough fibrous layer of connective tissue that surrounds the corpora cavernosa of the penis tunica albuginea (testicles), a layer of connective tissue covering the testicles tunica albuginea (ovaries), the connective tissue covering of the ovaries tunica albuginea oculi, the tough fibrous layer that covers most of the eyeball. look up tunica albuginea in wiktionary, the free dictionary.