- Adventitia
Infobox Anatomy
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Caption = Layers of Esophageal Wall:
1.Mucosa
2.Submucosa
3.Muscularis
4. Adventitia
5.Striated muscle
6. Striated and smooth
7.Smooth muscle
8. Laminamuscularis mucosae
9.Esophageal glands
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DorlandsPre = t_22
DorlandsSuf = 12831681Adventitia is the outermost
connective tissue covering of any organ, vessel, or other structure.eMedicineDictionary|adventitia] It is also called the tunica adventitia.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 complementary 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 inserosa (a layer ofmesothelium , thevisceral peritoneum )
* retroperitoneal organs are covered in "adventitia" (loose connective tissue )In the
gastrointestinal tract , themuscularis externa is bounded in most cases by serosa. However, at the thoracicesophagus , ascending colon, descending colon and the rectum, the muscularis externa is instead bounded by adventitia. (The muscularis externa of theduodenum is bounded by both tissue types.)The connective tissue of the
gallbladder is covered by adventitia where the gallbladder bounds theliver , but by serosa for the rest of its surface.ee also
*
Lumen (anatomy) References
External links
* - "Mammal, whole system (LM, Low)"
* (vermiform appendix )
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