Photomicrograph of a cross section through the vermiform appendix. The vermiform appendix displays the same four layers as those of the large intestine except that its diameter is smaller. Typically, lymphatic nodules are seen within the entire mucosa and usually extend into the submucosa. Note the distinct germinal centers within the lymphatic nodules. The muscularis externa is composed of a relatively thick circular layer and a much thinner outer longitudinal layer. The appendix is covered by a serosa that is continuous with the mesentery of the appendix (lower right). xlO.
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