Plate 10.204 Appendix
Ronald A. Bergman, Ph.D., Adel K. Afifi, M.D., Paul M. Heidger,
Peer Review Status: Externally Peer Reviewed
Human, 10% formalin, H. & E., 50 x.
The histologic structure of the appendix resembles that of the colon. The overall diameter and the lumen are, however, much smaller than that of the colon; the lumen is often obliterated by debris.
Mucosa: Consists of the lining columnar epithelium (which lacks villi), simple tubular intestinal glands (crypts of Lieberkühn), muscularis mucosae, and numerous and conspicuous lymph nodules.
Submucosa: Thick and rich in fat cells.
Muscularis: Relatively thin and composed of two layers of smooth muscle: inner circular and outer longitudinal.
Serosa: Loose areolar connective tissue coat continuous with the mesentery that surrounds the appendix.
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