Adventitia
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| Adventitia | |
|---|---|
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| Layers of Esophageal Wall: 1. Mucosa 2. Submucosa 3. Muscularis 4. Adventitia 5. Striated muscle 6. Striated and smooth 7. Smooth muscle 8. Lamina muscularis mucosae 9. Esophageal glands | |
| Dorlands/Elsevier | t_22/12831681 |
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Overview
Adventitia is the outermost connective tissue covering of any organ, vessel, or other structure.
For example, the connective tissue that surrounds an artery is called the tunica adventitia because it is considered extraneous to the artery.
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.)
The connective tissue of the gallbladder is covered by adventitia where the gallbladder bounds the liver, but by serosa for the rest of its surface.
See also
External links
- adventitia at eMedicine Dictionary
- Organology at UC Davis Digestive/mammal/system1/system10 - "Mammal, whole system (LM, Low)"
- Histology at OU 55_07 (vermiform appendix)
- Histology at USC rep/c_53 (uterus)
- Histology at USC rep/c_62 (vagina)
tissue layers |
|---|
| mesothelium, serosa/adventitia, muscularis externa (outer & inner), submucosa, mucosa (muscularis mucosa, lamina propria, epithelium), lumen |
Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
