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The layers of the recto-sigmoid colon, as graphical representation (upper figure), in eosin-stained healthy recto-sigmoid colon (lower left) and eosin-stained endometriosis-affected recto-sigmoid colon (lower right).
1. Serosa (sigmoid) or Adventitia (rectum); 2. Subserosa; 3. Tunica muscularis (outer longitudinal layer, inner circular layer) with Plexus myentericus in between; 4. Submucosa with Plexus submucosus, blood, and lymphatic vessels; 5. Mucosa.
