Скачать или смотреть The 4 Layers of the Alimentary Canal

This video describes the functions of the 4 layers of the Alimentary canal. The alimentary canal is the part of the digestive system that food actually passes through (the "food tube.") and excludes accessory digestive organs such as the liver and pancreas. There are 4 layers to the alimentary canal that are made up of different tissue types. From inner most to outmost the order goes mucosa, submucosa, muscle, and serosa.

Mucosa - innermost, produces mucous which helps food move along and protects more delicate tissues from being digested.

Submucosa - lots of blood vessels that nourish surrounding tissues.

Muscle - moves the food along through muscular contractions.

Serosa - produces serous fluid which protects and lubricates the outermost layer from sticking to other organs.

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