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Bike duct make it simple and easy tricks to remember
Here's a quick, easy-to-remember breakdown of the Bile Duct (Common Bile Duct / CBD) from the image:
🧠 BILE DUCT - EASY MEMORY TRICKS
📏 Quick Facts
- Formed by union of cystic duct + common hepatic duct
- Length: 7.5 cm | Diameter: ≤ 8 mm
4 PARTS - Mnemonic: "S R I I" → "Some Real Indians Intrude"
| # | Part | Key Relation |
|---|---|---|
| 1 | Supraduodenal | Anterior to portal vein, right of hepatic artery - most accessible surgically |
| 2 | Retroduodenal | Behind 1st part of duodenum; gastroduodenal artery on LEFT, portal vein + IVC on POSTERIOR |
| 3 | Infraduodenal (Pancreatic) | Runs in groove on pancreas; separated from IVC by thin pancreatic tissue |
| 4 | Intraduodenal (Intramural) | Enters posteromedial wall of duodenum; joins pancreatic duct at Ampulla of Vater |
3 SPHINCTERS at the Terminal Part - Mnemonic: "Boy Pancs Odd"
| Sphincter | Around |
|---|---|
| Sphincter choledochus (of Boyden) | Bile duct |
| Sphincter pancreaticus | Pancreatic duct |
| Sphincter ampulla (of Oddi) | Ampulla |
Trick: "Oddi opens with CCK" - CCK causes gallbladder contraction AND relaxes Oddi's sphincter
🩸 Arterial Supply - Mnemonic: "Up-Cystic, Mid-Hepatic, Down-Gastro"
| Part | Supply |
|---|---|
| Upper | Cystic artery (descending branch) |
| Middle | Right hepatic artery |
| Lower | Gastroduodenal + superior pancreaticoduodenal arteries |
🔺 Cystohepatic Triangle of Calot - "CHL"
- Cystic duct (right side)
- Hepatic duct, common (left side)
- Liver inferior surface (above/apex)
Contents: Right hepatic artery + cystic artery + cystic lymph node of Lund
⚡ Key Clinical Points
- Retroduodenal part: Superior pancreaticoduodenal artery crosses it - source of haemorrhage
- Supraduodenal = most accessible for surgery
- Poor anastomosis of pancreaticoduodenal arteries → ligation → gangrene of CBD
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