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Encyclopedia > Muscularis mucosae
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Section of mucous membrane of human rectum. X 60. (Muscularis mucosae labeled at bottom right.)
Section of the human esophagus. Moderately magnified. The section is transverse and from near the middle of the gullet. a. Fibrous covering. b. Divided fibers of longitudinal muscular coat. c. Transverse muscular fibers. d. Submucous or areolar layer. e. Muscularis mucosae. f. Mucous membrane, with vessels and part of a lymphoid nodule. g. Stratified epithelial lining. h. Mucous gland. i. Gland duct. m’. Striated muscular fibers cut across.
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Section of the human esophagus. Moderately magnified. The section is transverse and from near the middle of the gullet. a. Fibrous covering. b. Divided fibers of longitudinal muscular coat. c. Transverse muscular fibers. d. Submucous or areolar layer. e. Muscularis mucosae. f. Mucous membrane, with vessels and part of a lymphoid nodule. g. Stratified epithelial lining. h. Mucous gland. i. Gland duct. m’. Striated muscular fibers cut across.

The thin layer of smooth muscle found in most parts of the gastrointestinal tract located outside the lamina propria mucosae and adjacent to the submucosa. The mucous membranes (or mucosae; singular: mucosa) are linings of ectodermic origin, covered in epithelium, and are involved in absorption and secretion. ... The posterior aspect of the rectum exposed by removing the lower part of the sacrum and the coccyx. ... The esophagus (also spelled oesophagus/Å“sophagus), or gullet is the muscular tube in vertebrates through which ingested food passes from the mouth area to the stomach. ... Smooth muscle is a type of non-striated muscle, found within the walls of hollow organs; such as blood vessels, the bladder, the uterus, and the gastrointestinal tract. ... The gastrointestinal tract or digestive tract, also referred to as the GI tract or the alimentary canal, (nourishment canal) or the gut, is the system of organs within multicellular animals which takes in food, digests it to extract energy and nutrients, and expels the remaining waste. ... The lamina propria is a thin vascular layer of connective tissue beneath the epithelium of an organ. ...


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