Mucus, which provides lubrication for the passage of feces, is secreted by compression of the
a. anal orifice. c. anoderm.
b. anal sinuses. d. anal valves.
B
There are pockets located superior to the anal valves that are called the anal sinuses. These sinuses secrete mucus when they are compressed by feces, providing lubrication that eases fecal passage. The anal orifice is located at the seam of the gluteal folds; it serves as the exit to the gastrointestinal tract. Anoderm, a thick, pale, stratified, squamous epithelium that contains no hair follicles, sweat glands, or sebaceous glands lines the lower 2 cm of the anal canal. The anal valves are formed by inferiorly joining anal columns located below the anal sinuses toward the anal orifice.
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