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Anatomy Atlases: Atlas of Microscopic Anatomy: Section 1 - Cells Atlas of Microscopic Anatomy: Section 10 - Digestive System

Plate 10.204 Appendix

Ronald A. Bergman, Ph.D., Adel K. Afifi, M.D., Paul M. Heidger, Jr., Ph.D.
Peer Review Status: Externally Peer Reviewed


Plate 10.204 Appendix

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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