What is the peculiarity of the structure of the walls of the alimentary canal?

The wall of the alimentary canal consists of three layers: outer (connective tissue), middle (muscle tissue), and inner (epithelial tissue). The muscular layer of the oral cavity, pharynx and the upper third of the esophagus consists of striated muscles (a person can regulate the work of these parts of the alimentary canal), and the muscular layer of the underlying parts is represented by smooth muscles.

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