To some degree, its role is complimentary to that of the serosa, which also provides a layer of tissue surrounding an organ. In the abdomen, whether an organ is covered in adventitia or serosa depends upon whether it is peritoneal or retroperitoneal:
- peritoneal organs are covered in serosa (a layer of mesothelium, the visceral peritoneum)
- retroperitoneal organs are covered in adventitia (loose connective tissue)
In the gastrointestinal tract, the muscularis externa is bounded in most cases by serosa. However, at (the thoracic esophagus, ascending colon, descending colon and the rectum), the muscularis externa is instead bounded by adventitia. (The muscularis externa of the duodenum is bounded by both tissue types.)
- Template:UCDavisOrganology - "Mammal, whole system (LM, Low)"
- Template:OklahomaHistology (vermiform appendix)
- Histology at University of Southern California rep/c_53 (uterus)
- Histology at University of Southern California rep/c_62 (vagina)