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The tunica muscularis of the duodenum (100X)

Microimage
Tunica muscularis. Image copyright: University of Oslo, CC BY-NC-ND 4.0. (Tissue stain: H+E).

The tunica muscularis is divided in two:

  • a longitudinal layer and
  • a circular layer

Study how the muscular layer is cut to differentiate the two components (remember this is a longitudinal section of the duodenum). The tunica serosa covers the outermost part of the tunica muscularis. The tunica serosa is made up of single layered squamous epithelium, the mesothelium. It lines the peritonneal cavity.

Published September 4th 2021, updated October 10th 2021.