401002 Lecture Notes - Lecture 14: Muscularis Mucosae, Muscular Layer, Submucous Plexus
16 Feb 2020
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Document Summary
The gastrointestinal tract has a form of general histology with some differences that reflect the specialization in functional anatomy. The gi tract can be divided into four concentric layers in the following order: mucosa, submucosa, muscular layer, adventitia or serosa. The mucosa is the innermost layer of the gastrointestinal tract. The mucosa surrounds the lumen or open space within the tube. This layer comes in direct contact with digested food (chyme). The mucosa is made up of: epithelium innermost layer. Responsible for most digestive, absorptive and secretory processes: lamina propria a layer of connective tissue. The mucosae are highly specialized in each organ of the gastrointestinal tract to deal with the different conditions. The most variation is seen in the epithelium. The submucosa consists of a dense irregular layer of connective tissue with large blood vessels, lymphatics, and nerves branching into the mucosa and muscularis externa.
