Name the four hepatic divisions based on functional blood flow and the Couinaud classification basis.
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Answer
Right hemiliver, left hemiliver (by midline hepatic vein). Further divided into 8 functional segments (Couinaud) based on blood supply and venous drainage. Surgeons use this — allows precise resection while preserving blood/bile flow to remnant.
LO 1 — Porta Hepatis
What three structures enter the porta hepatis, and what is the mnemonic?
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Answer
Bile duct, Hepatic artery, Portal vein (BHP, or "BAD" anterior to posterior: Bile duct, Artery, Duct)
Portal vein is the largest, hepatic artery is smallest. All three travel in the hepatoduodenal ligament.
Right + left hepatic ducts → Common hepatic duct (CHD) → joins cystic duct (from gallbladder) → Common bile duct (CBD) → ampulla of Vater in duodenum (2nd part)
Sphincter of Oddi controls flow into duodenum. Mirizzi syndrome = stone in cystic duct → obstructs CHD.
LO 1 — Gallbladder
Name the three parts of the gallbladder, identify Hartmann's pouch and Calot's triangle, and state what Mirizzi sign indicates.
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Answer
Fundus (tip), body, neck (tapers).Hartmann's pouch = pouch at junction of neck/body where stones lodge. Calot's triangle = bounded by cystic artery, CHD, liver edge — where cystic artery is identified during cholecystectomy. Mirizzi syndrome = impacted stone in cystic/CHD obstructs CHD → jaundice.
LO 1 — Murphy's Sign
Define Murphy's sign and Murphy's point. Clinical context?
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Answer
Murphy's sign: inspiratory arrest during palpation of RUQ (tenderness over gallbladder). Murphy's point: location on liver edge where gallbladder touches. Positive Murphy's = classic sign of acute cholecystitis. Pain occurs as GB contracts against inflamed wall during inspiration.
LO 2 — Splenic Artery
Trace the splenic artery. Name its two major branches and what each supplies.
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Answer
Splenic artery (from celiac) → short gastric arteries (to greater curvature stomach, via gastrosplenic ligament) + left gastroepiploic artery (to greater curvature, via gastrosplenic ligament) → tail ends in splenic hilum.
Gastrosplenic ligament contains splenic vessels + left gastric vessels.
LO 2 — Splenorenal Ligament
What structures run in the splenorenal ligament? Clinical significance?
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Answer
Splenic artery + splenic vein + pancreatic tail run in splenorenal ligament (posterior peritoneum, between spleen + left kidney).
Splenic vein joins SMV → portal vein. During splenectomy, must ligate splenic vessels in this ligament. Splenic trauma (most common blunt visceral injury) → blood loss into this space.
LO 2 — Sinistral Portal HTN
What is sinistral portal hypertension? Common cause?
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Answer
Sinistral portal HTN: elevated pressure in splenic vein ONLY (not portal vein). Common cause: pancreatic pathology (cancer, chronic pancreatitis) compresses/thromboses splenic vein.
Why is the spleen the most injured organ in blunt abdominal trauma? Name two key clinical signs.
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Answer
Friable (vascular), fixed in place → easily disrupted by impact. Kehr's sign: left shoulder pain from diaphragmatic irritation by splenic blood. Cullen's sign: periumbilical bruising from retroperitoneal bleeding. Splenic infarct risk post-trauma from vascular injury.
LO 2 — Splenectomy Sequelae
What infection risk follows splenectomy (OPSI)? Which organisms? Lasting sign?
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Answer
OPSI (overwhelming post-splenectomy infection): risk of fulminant sepsis from encapsulated organisms. SHiN organisms:Streptococcus pneumoniae, Haemophilus influenzae, Neisseria meningitidis.
Howell-Jolly bodies: nuclear remnants visible on blood smear post-splenectomy (normally removed by spleen). Lifelong vaccination + prophylactic antibiotics advised.
LO 3 — Pancreas Position
Where is the pancreas located? Which structures surround it and why is it vulnerable?
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Answer
Retroperitoneal, L1–L2 (spine posterior). Head sits in C of duodenum, tail touches spleen. Anterior: SMA/SMV, portal vein, duodenum. Vulnerable: retroperitoneal + surrounded by major vessels → trauma/inflammation → rapid compromise.
LO 3 — Pancreas Parts
Name the five parts of the pancreas from right to left.
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Answer
Head → uncinate process (extends left behind SMA/SMV) → neck → body → tail (touches spleen).
Uncinate process is a key landmark — CBD grooves its posterior surface. Neck is narrowest part (vulnerable to compression in annular pancreas).
LO 3 — Pancreatic Ducts
Name the two pancreatic ducts, their embryologic origin, and how they empty.
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Answer
Duct of Wirsung (main): from ventral pancreatic bud → joins CBD at ampulla of Vater (duodenum 2nd part). Duct of Santorini (accessory): from dorsal bud → minor duodenal papilla (3rd part, proximal to ampulla).
Pancreas divisum: Wirsung duct drains only the uncinate/ventral pancreas. Accessory duct drains dorsal pancreas → vulnerable to obstruction (pancreatitis risk).
LO 3 — Courvoisier Law
State Courvoisier law and its clinical implication for pancreatic cancer diagnosis.
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Answer
Courvoisier law:Painless jaundice + palpable gallbladder = pancreatic head cancer until proven otherwise. (Stone-induced jaundice usually causes pain + rigid GB.)
Annular pancreas: pancreatic tissue rings the second portion of duodenum (embryologic malrotation). May cause duodenal obstruction = epigastric pain, postprandial vomiting, chronic dyspepsia.
Can present in infants (projectile vomiting) or adults (chronic). Diagnosis: upper endoscopy shows duodenal obstruction; CT/MRI shows ring.
LO 3 — Acute Pancreatitis
List the major causes of acute pancreatitis using the "GET SMASHED" mnemonic.
Serum amylase peaks at 24–48 h. Lipase more specific and stays elevated longer.
LO 4 — Bile Composition
What are the major constituents of bile and their functions?
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Answer
Bile salts: emulsify fats → micelles → absorption of fat-soluble vitamins (ADEK). Cholesterol, phospholipid, bilirubin — cholesterol can crystallize → gallstones if ratio imbalanced.
Released via CCK in response to fat/protein. Enterohepatic circulation: ~95% bile salts reabsorbed in terminal ileum → recycled 8–10 times daily.
LO 4 — First-Pass Metabolism
Why is the portal vein route "first-pass" and what are the clinical implications?
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Answer
Portal vein blood from intestines → liver FIRST → hepatic vein → systemic circulation. Absorbed nutrients/drugs undergo hepatic metabolism BEFORE entering systemic circulation.
Clinical implication: oral drugs are subject to first-pass metabolism (may be largely inactivated by liver). Sublingual/transdermal routes bypass liver initially.
LO 4 — CCK & Secretin
What stimulates CCK and secretin release? What are their effects?
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Answer
CCK: fat + protein in duodenum (I-cells) → GB contraction + pancreatic enzyme secretion + sphincter of Oddi relaxation. Secretin: acid (pH <4) in duodenum (S-cells) → pancreatic HCO₃⁻ secretion (neutralizes acid) + ↓gastric acid.
Both are hormones, released into blood, NOT the lumen.
LO 4 — Pancreatic Acinar vs. Ductal
Distinguish pancreatic acinar cells from ductal epithelium in terms of secretory products.
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Answer
Acinar cells: produce digestive zymogens (trypsinogen, chymotrypsinogen, lipase, amylase). Released into duct system. Ductal epithelium: produces bicarbonate (HCO₃⁻) rich fluid that buffers stomach acid + creates neutral pH for enzyme activity.
Inactive until enterokinase (from duodenal mucosa) converts trypsinogen → trypsin → activates other enzymes.
FIB 01 — LO 1
The common hepatic duct joins the ___________ duct to form the common bile duct, which enters the duodenum at the ___________.
Hint: The gallbladder drains via one specific duct.
FIB 02 — LO 1
The ___________ sign is a clinical finding where inspiratory arrest occurs during RUQ palpation, indicating acute cholecystitis.
Hint: Named after a surgical examination technique.
FIB 03 — LO 1
The ___________ triangle is bounded by the cystic artery, common hepatic duct, and liver edge — surgeons use this landmark during cholecystectomy.
Hint: Begins with "C".
FIB 04 — LO 2
The splenic artery branches into ___________ arteries (to stomach) and ___________ artery (to greater omentum), both traveling in the gastrosplenic ligament.
Hint: Both are part of the omental blood supply.
FIB 05 — LO 2
The ___________ ligament contains the splenic artery, splenic vein, and pancreatic tail, running between the spleen and left kidney.
Hint: Connects spleen to kidney.
FIB 06 — LO 2
___________ portal hypertension occurs when pancreatic pathology obstructs the splenic vein, resulting in elevated pressure in the splenic vein only, causing isolated ___________ varices.
Hint: Sinistral = left side.
FIB 07 — LO 3
The pancreas is located ___________ (positioning) at level ___________. The pancreatic head sits in the "C" of the ___________.
FIB 08 — LO 3
The ___________ duct (main pancreatic duct) joins the CBD at the ampulla of Vater. The ___________ duct (accessory) drains separately into the 3rd part of duodenum.
Hint: German anatomist names.
FIB 09 — LO 3
In acute pancreatitis, serum ___________ peaks at 24–48 hours and is the gold-standard marker, while ___________ is more specific and stays elevated longer.
Hint: Lipase is pancreas-specific.
FIB 10 — LO 4
Bile salts emulsify ___________ and form ___________, which allows absorption of fat-soluble vitamins (ADEK). Approximately ___________% of bile salts are reabsorbed in the terminal ileum via enterohepatic circulation.
Instructions: Drag and drop the items into the correct order, then click "Check Order." Use "Show Answer" if you get stuck.
Drill 1 — Pancreatic Buds Embryology: Ventral → Union
Arrange the steps of pancreatic bud development and fusion in the correct chronological order.
⠿Ventral bud rotates with duodenum during rotation, ending dorsal to dorsal bud
⠿Dorsal and ventral pancreatic buds form from endoderm (week 4-5)
Surgical treatment for pancreatic head cancer (pancreaticoduodenectomy)
Score: 0/3 correct
Test Trap Mode: Each statement is either TRUE or FALSE as written. Many are designed to catch common exam errors. Click T or F — then read the explanation carefully.
Trap 01 — LO 1
"The common bile duct runs anterior to the portal vein in the hepatoduodenal ligament."
TRUE. Classic anatomy: In the hepatoduodenal ligament, the mnemonic "BAD" describes anterior-to-posterior arrangement: Bile duct (anterior), Artery (hepatic), Duct (portal vein). Portal vein is largest and most posterior.
Trap 02 — LO 1
"Mirizzi syndrome is caused by a stone in the gallbladder body obstructing the cystic duct."
FALSE. Mirizzi syndrome occurs when a stone in the cystic duct (not GB body) directly obstructs the common hepatic duct — not the cystic duct. The impacted stone → external compression of CHD → jaundice. Classic "trap" because students confuse the location.
Trap 03 — LO 2
"The splenic vein joins the superior mesenteric vein to form the portal vein."
TRUE. Splenic vein + SMV = portal vein (behind pancreatic neck). The splenic vein travels through the splenorenal ligament, containing the pancreatic tail. High-yield board fact.
Trap 04 — LO 2
"Portal hypertension always presents with esophageal varices due to backup into the portal vein."
FALSE. Sinistral portal hypertension (splenic vein obstruction only) causes isolated gastric varices (short gastrics), NOT esophageal varices. True portal HTN (whole system) → esophageal varices. Knowing the difference is critical for board exams.
Trap 05 — LO 3
"The duct of Santorini (accessory pancreatic duct) is the main drainage pathway for the entire pancreas in most people."
FALSE. The duct of Wirsung (main pancreatic duct) is the primary drainage pathway → ampulla of Vater. Santorini is the accessory duct (from dorsal bud) → minor duodenal papilla. Pancreas divisum = abnormal persistence of separate ducts, NOT the normal state.
Trap 06 — LO 3
"Courvoisier sign refers to a positive Murphy's sign in acute cholecystitis."
FALSE.Courvoisier law (not sign) states: painless jaundice + palpable GB = pancreatic head cancer (until proven otherwise). Murphy's sign = RUQ tenderness in cholecystitis. Different findings, different causes!
Trap 07 — LO 4
"Bile salts are absorbed throughout the small intestine and recycled 8-10 times daily."
FALSE. Bile salts are absorbed specifically in the terminal ileum (not throughout SI). ~95% are reabsorbed via enterohepatic circulation, recycled 8-10 times daily. This is why ileal disease/resection causes diarrhea and fat malabsorption.
Trap 08 — LO 4
"CCK is released in response to gastric acid and triggers pancreatic bicarbonate secretion."
FALSE.Secretin (not CCK) is released by acid → triggers pancreatic HCO₃⁻. CCK is released by fat + protein → gallbladder contraction + pancreatic enzyme secretion. Easy to mix up — memorize: acid=secretin+HCO3; fat/protein=CCK+enzymes.
Pancreatic Anatomy at a Glance
Part
Location/Boundaries
Key Features
Head
Within C-curve of duodenum
Largest segment; contains common bile duct groove on posterior
Uncinate process
Extension from head, behind SMA/SMV
Extends leftward; compressed in annular pancreas
Neck
Narrowest part; anterior to portal vein union
Ventral pancreatic bud origin; vulnerable in trauma