C2:S3 - Blood Supply to the Gut Tube Flashcards
1
Q
What are the 3 unpaired branches of the abdominal aorta that supply the gut?
A
- Coeliac (T12)
- SMA (L1)
- IMA (L3)
2
Q
A
3
Q
Identify these veins
A
Top to bottom
- IVC
- Common hepatic vein
- Hepatic portal vein
- Splenic vein
- Superior mesenteric vein
- Inferior mesenteric vein
4
Q
Study this and then answer the questions
A
5
Q
What are the foregut structures?
A
- Abdominal part of the oesophagus
- Stomach
- 1st and 2nd part of the duodenum
- Liver
- Gallbladder
- Spleen
- Pancreas
6
Q
What is the blood supply of the foregut?
A
Coeliac artery
7
Q
What are the midgut structures and therefore supplied by the SMA?
A
- 3rd and 4th part of the duodenum
- Jejunum and ileum
- Caecum
- Appendix
- Ascending colon
- Proximal 2/3rds of transverse colon
8
Q
What is the blood supply of the midgut?
A
- SMA
9
Q
What are the hindgut structures?
A
- Distal 2/3rds of the transverse colon
- Descending colon
- Sigmoid colon
- Rectum
- Upper anal canal
10
Q
What is the blood supply of the hindgut?
A
IMA
11
Q
What is a portal system?
A
Any system of blood vessels that has a capillary bed at both ends
12
Q
What veins join together to form the hepatic portal vein?
A
- Splenic vein (remember the IMA drains into here)
- SMA
13
Q
What are portosystemic (portocaval) anastomoses?
A
- Blood from the gut tube superior to diaphragm and inferior to the pelvic floor drains into the systemic system
- This blood needs to enter the portal system so does so at anastomoses
14
Q
Where are the 4 portosystemic anastomosis?
A
- Distal oesophagus
- Rectal (sup. rectal vein)
- Paraumbilical
- Retroperitoneal
15
Q
What can portal hypertension cause in the rectal anastomoses?
A
Haemorrhoids
