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Mucous membrane
The mucous membranes (or mucosa) are linings of ectodermic[?] origin, covered in epithelium[?], that line various body cavities and internal organs. It is at several places continuous with skin: at the nostrils, the lips, the ears, the genitourinary[?] area, and the anus. The viscid secretion of the mucous membranes is termed mucus (note the spelling difference).
Body cavities featuring mucous membrane include most of the respiratory tract, the entire gastrointestinal tract, the urethra, and various other organs. In addition, the covering of the glans penis (head of the penis) and the inside of the prepuce (foreskin) is mucous membrane, not skin.
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