12. Midgut and Hindgut Flashcards
Which organs make up the midgut? (7)
1/2 of duodenum Jejunum Ileum Caecum Appendix Ascending colon 2/3 of transverse colon
What artery supplies the midgut?
Branches of superior mesenteric artery
At what vertebral level does the superior mesenteric artery branch from the aorta?
L1
Which organs make up the hindgut?
1/3 transverse colon Descending colon Sigmoid colon Rectum Anal canal
What artery supplies the hindgut?
Branches of inferior mesenteric artery
At what vertebral level does the inferior mesenteric artery branch from the aorta?
L3
Where does blood from the jejunum and ileum drain into
Superior mesenteric veins
Which arteries supply the jejunum and ileum?
Jejunal and ileal branches of superior mesenteric artery
Where does lymph from the jejunum and ileum drain?
Mesenteric nodes –>
Pre-aortic nodes at superior mesenteric artery (L1)
What is the nerve supply of the jejunum and ileum?
ANS superior mesenteric plexus
Where does pain from the jejunum and ileum refer?
Umbilical region
Name 3 features of the large intestine that aren’t seen in the small intestine
Haustra (sacculations of wall) Appendices epiploicae (fatty tags) Teniae coli (3 bands of longitudinal muscle)
Which region is the caecum located in?
Right iliac fossa
What is the ileocaecal valve?
Sphincter muscle valve that separates small and large intestine
What is the arterial supply of the caecum?
Caecal arteries form ilieocolic (branch of superior mesenteric)
Where does blood from the caecum drain?
Superior mesenteric vein
Where does lymph from the caecum drain?
Mesenteric then superior mesenteric nodes (at L1)
What is the nerve supply of the caecum?
ANS superior mesenteric plexus
In which region is the vermiform appendix found?
Right iliac
What is McBurney’s point?
Where base of appendix is usually found
1/3rd along line from ASIS to umbilicus
What is the arterial supply of the appendix?
Appendicular artery
Where does blood from the appendix drain?
Posterior caecal vein
Where does lymph from the appendix drain?
Mesenteric then superior mesenteric nodes (at L1)
What is the nerve supply of the appendix?
ANS superior mesenteric plexus
