Flashcards in 7. Digestive tract anatomy Deck (22):
Layers of gastrointestina tract - inside to outer
3. Muscularis externa
4. Serosa ( when intraperitoneal ) , adventitia when retroperitoneal
gi tract - mucosa - inner to outer
epithelium , lamina propria , muscularis mucosa
gi tract - submucosa ?
- includes submucosal nerve plexus ( Meissner )
-secretes fluids ( submucosal glands )
gi muscularis externa
- includes myenteric nerve plexus ( auerbach )
Messiner vs Auerbach nervers plexus according to the name and location
Meissner --> submucosal nerve plexus ( submucosa)
auerbach --> myenteric nerve plexus ( muscularis externa
gi tract - muscularis externa inner to outer
1. inner circular layer
2. myenteric nerve plexus ( AUerbach)
3. outer logitudial layer
Ulcers vs erosions
ulcers extend into submucosa , inner or outer musular layer
erosions are in mucosa only
gi tract - serosa contains
vein , artery , lumph vessels
gi tract - frequency of basal electric rhythm ( slow waves )
1. stomach - 3 waves / min
2. duodenum -12 waves / min
3. ileum - 8-9 waves / min
gi tract - slow waves originate in
the intestinal cell of Cajal ( pacemaker for GI SMCs)
• Which layer of the muscularis externa is closer to the gut lumen: the circular layer or the longitudinal layer?
The circular layer
• List the three components of the gut wall mucosa.
Epithelium, lamina propria, and muscularis mucosa
• What is the primary function of the epithelium of the gut wall mucosa?
• What is the primary function of the lamina propria of the gut wall mucosa?
• What is the primary function of the muscularis mucosa of the gut wall mucosa?
• If a patient is missing his submucosal nerve plexus, which gut function would be impaired?
Secretory activity (the Submucosa contains the Submucosal plexus, also known as the Meissner plexus)
• Which nerve plexus lies between the inner circular and outer longitudinal layers of the muscularis externa?
The Muscularis externa contains the Myenteric nerve plexus (also known as the Auerbach plexus), responsible for Motility
• List the four main layers of the gut wall, starting from the lumen.
Mucosa, submucosa, muscularis externa, and serosa
• List the basal electric rhythms of the stomach, duodenum, and ileum.
Stomach = 3 waves/min, duodenum = 12 waves/min, and ileum = 8–9 waves/min
• What layer(s) can ulcers extend into?
Submucosa, inner or outer muscular layer
• What is the outermost layer of the gut called when retroperitoneal?
Adventitia (the GI serosa exists only in the peritoneal cavity)