Serosa or Adventitia
|Transverse section of ureter.|
The muscular coat (muscular layer, muscular fibers, muscularis propria, muscularis externa) is a region of muscle in many organs in the vertebrate body, adjacent to the submucosa membrane. It is responsible for gut movement such as peristalsis.
It usually has two distinct layers of smooth muscle:
- inner and "circular"
- outer and "longitudinal"
However, there are some exceptions to this pattern.
- In the stomach and colon, there are three layers to the muscularis externa.
- In the upper esophagus, part of the externa is skeletal muscle, rather than smooth muscle.
- in the pyloric stomach, it forms the pyloric sphincter
- in the anal canal, it forms the anal sphincter
Wall of the ureter.
Layers of stomach wall.
Section of the human esophagus. Moderately magnified.
Section of duodenum of cat. X 60.
Vertical section of bladder wall.
- eMedicine Dictionary
- Histology at nhmccd.edu
- Muscularis externa of the colon
- Smooth muscle layers of the gut
- 52_05 - "Duodenum"
- Digestive/mammal/system1/system7 - "Mammal, whole system (LM, Low)"
- 11601ooa - "Muscle Tissue: smooth muscle, muscularis externa"
- 10802loa - "Digestive System: Alimentary Canal - esophagus "
|This musculoskeletal system article is a stub. You can help World Heritage Encyclopedia by expanding it.|
|This digestive system article is a stub. You can help World Heritage Encyclopedia by expanding it.|