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Testes

...  roughly 4 centimetres long and around 2.5 centimetres in diameter. The testes are encased within two distinct layers of tissue known as tunics. The outer tunic is a thin layer which is known as the tunica vaginalis. Whenever the testes descend, a layer of fine serous peritoneum drops along with it create the outer layer. The inner layer, known as the tunica albuginae, is much stronger and made  ...