Mid + Hindgut

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lizzielizzie
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Last updated: May 10, 2026
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First submittedMay 10, 2026
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Lumen of Jejunum (vs Ileum)
Wide
Walls of Jejunum (vs Ileum)
Thick
Plicae Circulares (folds) Jejunum (vs Ileum)
Dense
Jejunum blood Supply - arcades + vasa recta (vs ileum)
Few arterial arcades, long vasa recta
Peyer's Patches (lymphoid follicle clusters) Jejunum (vs Ileum)
Few
Mesenteric fat in Jejunum (vs Ileum)
Less
 
 
Meckel's diverticulum
Congenital bulge of ilium - failure of vitelline duct obliteration
Hernia medial to inferior epigastric vessels. Does not traverse entire inguinal canal, doesn't enter scrotum
Direct Inguinal Hernia (acquired)
Hernia lateral to inf. epigastric vessels.Traverses entire inguinal canal, enters scrotum
Indirect Inguinal Hernia (congenital)
 
 
Appendix intra or retroperitoneal? Suspended by what?
intraperitoneal, mesoappendix
McBurney's Point location
lateral third from ASIS to umbilicus
Ascending Colon intra or retroperitonal?
secondary retroperitoneal
Blood Supply to Ascending colon
Right Colic Artery
Point where midgut becomes hindgut
2/3 distally along transverse colon
 
 
Transverse colon intra/retroperitoneal? Level?
Intraperitoneal, L1
Transverse colon closely associated with what structure?
Greater omentum
Transverse colon blood supply (+ arises from where?)
Middle Colic Artery, SMA
 
 
SMA branches (from jejunum to transverse colon)
Jejunal
SMA branches
Ileal + ileocolic
Hint
Answer
SMA branches
Middle colic
SMA branches
Right colic
 
 
Hepatic Portal Vein formed of what?
Superior mesenteric vein and splenic vein
SNS innervation of midgut
Lesser thoracic splanchnic nerves
PNS innervation of midgut
Vagus
Plexuses modulated by ANS
Submucosal and myenteric plexus in intestinal walls
 
 
Last part of Hindgut + dividor
Upper half of anal canal, pectinate line
Descending Colon intra or retroperitoneal usually?
Secondary retroperitoneal
Level of rectosigmoid junction
S3
 
 
2 Factors that help maintain continence
Anorectal flexure angle
Factors that help maintain continence
Ampulla of rectum
 
 
Epithelium superior + inferior to pectinate line
Columnar + stratified squamous
Arterial supply + venous drainage superior + inferior to pectinate line
Superior rectal, middle and inferior rectal
Nervous supply superior + inferior to pectinate line
Inferior hypogastric plexus, Inferior rectal from pudendal nerve
Lymphatic drainage superior + inferior to pectinate line
Internal iliac nodes, superficial inguinal nodes
What vertebral level does IMA arise from AA
L3
 
 
Branches of IMA (4)
Left Colic (and ascending + descending)
Branches of IMA
Sigmoid
Branches of IMA
Superior rectal
Branches of IMA
Marginal artery
 
 
What acts as the collateral supply for hind and midgut?
Marginal artery of Drummond allows anastomosis between SMA and IMA
Where does middle rectal artery arise from?
Internal iliac
Where does inferior rectal artery arise from
Internal Pudendal
 
 
Superior rectal vein drainage
Inferior mesenteric vein (portal system)
Middle rectal vein drainage
Internal iliac (systemic)
Inferior rectal vein drainage
Internal Pudendal (systemic
 
 
Lymphatic Drainage of Hindgut
intestinal lymphatic trunk and cisterna chyli
 
 
Where is gallbladder pain often referred to
back of the shoulder
Effects of portal hypertension in terms of blood flow systems
Blood flows from portal system to systemic vein system and dilation can cause rupture
 
 
4 Major Anastomoses between portal and systemic circulations. Causes varices/signs
Oesophageal branches of azygos + left gastric vein
4 Major Anastomoses (anorectal)
superior and inferior rectal veins
4 Major Anastomoses (caput medusa)
paraumbilical veins and periumbilical superficial epigastric veins
4 Major Anastomoses (gastric varices)
left gastric and short gastric veins to oesophageal plexus
Hard to drain cos of high portal pressure
Splenic vein causing splenomegaly
 
 
What's cholelithiasis?
Gallstone formation
Associations of gallstones
female, fair, fat, forty, fertile
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