Esophagus Flashcards
Narrowest portion of GIT
Pharyngoesophageal junction
Diaphragmatic openings
T8- IVC, Phrenic nerve
T10- esophagus, vagus nerve, left gastric artery
T12- aorta, thoracic duct
REMEMBER I8 10 eggs at 12
What should be done if a foreign body gets impacted in esophagus ?
Endoscopic removal
Most common site for iatrogenic perforation in esophagus?
C6- narrowest- pharyngoesophageal junction
What type of blood supply does esophagus receive? Which artery is involved in Mallory Weiss tear?
Segmental supply. Left gastric artery.
Upper 3rd of esophagus blood supply
Inferior thyroid artery and vein.
Middle 3rd esophagus blood supply
Descending thoracic aorta, bronchial artery. Azygos vein
Lower 3rd esophagus blood supply
Left gastric artery and vein ( coronary vein). Vein drains into portal vein to liver. Mets from eso to liver.
Type of mets in esophageal carcinoma
Lymphatic- longitudinal, skip mets
Based on nature of sphincter, how are upper and lower esophagus sphincters different?
Upper- both anat, physio entity (narrowing, high pressure)
Lower- only physio 8-25 mm hg
How does the LES act when food enters the esophagus ?
Les is tonic, relaxes when food enters and contracts again.
What happens les relaxes frequently or fails to relax?
Relaxes too frequently- GERD
Fails to relax- achalasia cardia
Which layer does the esophagus lack? Which is the strongest layer?
Serosa , submucosa
Types of peristalsis in esophagus
Primary- propulsive wave pushes food down
Secondary- if primary can’t push, propulsive secondary peristaltic wave formed
Tertiary- non propulsive, in between meals.
Condition where tertiary peristalsis is too frequent
Presbyoesophagus