Bleeding in the GI tract 2 Flashcards
Where are the Paracolic gutters (Right and Left)?
Between the lateral edge if the ascending and descending colon and the
abdominal wall.
(Part of greater sac of peritoneal cavity)
3 distinct longitudinal bands of thickened smooth muscle, running from caecum to distal end of sigmoid colon
Teniae coli
3 midline branches of abdominal aorta
Celiac trunk
Superior Mesenteric artery
Inferior Mesenteri artery
Which venous system drains venous blood from absorptive parts of the GI tract & associated organs to the liver for ‘cleaning’?
Hepatic Portal Venous System
Marginal artery of Drummond
Predominant arterial anastomosis between superior mesenteric artery and inferior mesenteric artery?
(these anastomoses could help prevent intestinal ischaemia)
Which venous system drains venous blood from all other organs and tissues into the superior or inferior vena cavae?
Systemic Venous System
drains cleaned blood from the hepatic veins into the right atrium
IVC
retroperitoneal
drains blood from foregut, midgut and hindgut structures to the liver for first pass metabolism
Hepatic Portal Vein
drains blood form foregut structures to hepatic portal vein
Splenic vein
drains blood from midgut structures to hepatic portal vein
Superior mesenteric vein
drains blood from hindgut structures to splenic vein
Inferior mesenteric vein
3 clinically important sites of venous anastomosis between the systemic and the portal venous systems
Distal end of oesophagus
Skin around umbilicus
Rectum/anal canal
superior rectal vein to..
middle rectal vein to..
inferior rectal vein to..
superior rectal vein to inferior mesenteric vein
middle rectal vein to internal iliac vein
inferior rectal vein to internal iliac vein
What happens to the collateral veins if the blood pressure in the portal venous system is raised?
Portal hypertension
increased bp within portal veins
Presentation of portal hypertension:
Oesophageal varices
Caput medusae
Rectal Varices
