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Testes

...  relating to the secondary sex organs. Each testicle is 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  ...

Large Intestine

...  is formed by skeletal muscles. Anal columns are the long partitions of vascular mucous membranes along the anal canal. The large intestine and the small intestine both have the same basic structural tunics, although they do have quite a few differences. The large intestine is marked by the absence of intestinal villi, and the presence of ample goblet cells that produce protective mucous in the  ...

Tunics

...  refer to the layers found on the GI tracts. There are four tunics, and they extend from the esophagus to the anal canal. Each tunic is lined with specialized tissues that are important to digestion. The gastrointestinal tract’s most internal tunic is the mucosa. The other three tunics are (from the next most interior to the exterior) the sub-mucosa, the muscularis and the serosa. The  ...