Learning Objectives
- Identify the five anatomical parts of the pancreas and their peritoneal status.
- Understand the transpyloric plane (L1) and surrounding organ relations.
- Master the ductal system, including the Ampulla of Vater and Sphincter of Oddi.
- Analyze the dual arterial supply from the Coeliac Trunk and the Superior Mesenteric Artery.
- Recall the “GET SMASHED” mnemonic for the causes of pancreatitis.
Anatomical Position & Relations
The pancreas is a lobulated, J-shaped gland situated at the level of the transpyloric plane (L1). It is primarily retroperitoneal, except for the tail.
Key Organ Relations
- Anterior: Stomach (separated by the lesser sac) and Transverse Mesocolon.
- Lateral (Right): The C-shaped curve of the Duodenum.
- Lateral (Left): The Spleen (connected via the splenorenal ligament).
- Posterior: Aorta, IVC, and Common Bile Duct.
Anatomical Structure
The pancreas is divided into five distinct regions, each with specific vascular landmarks:
| Part | Defining Feature |
|---|---|
| Head | Widest part; nestled in the duodenal curve. |
| Uncinate Process | Hook-like projection; lies posterior to the Superior Mesenteric vessels. |
| Neck | Overlies the Superior Mesenteric vessels. |
| Body | Central portion; crosses the midline. |
| Tail | The only intraperitoneal part is contained within the splenorenal ligament. |
The Exocrine Duct System
The pancreas functions as an exocrine gland by secreting digestive enzymes into the duodenum.
- Acinar Cells: Clusters that produce enzyme precursors.
- Main Pancreatic Duct: Runs the entire length of the gland.
- Ampulla of Vater: Formed by the union of the pancreatic duct and the Common Bile Duct.
- Sphincter of Oddi: The muscular valve controlling the flow of bile and pancreatic juice into the duodenum via the major duodenal papilla.
Vasculature & Lymphatics
The pancreas sits at the junction of the foregut and midgut, receiving blood from both:
- Coeliac Trunk: Supplies the body and tail (via splenic artery) and the superior head (via gastroduodenal artery).
- Superior Mesenteric Artery (SMA): Supplies the inferior head and uncinate process (via inferior pancreaticoduodenal artery).
- Venous Drainage: The head drains into the SMV; the rest drains into the Splenic Vein. Both eventually form the Portal Vein.
Clinical Relevance: Pancreatitis
Inflammation of the pancreas often presents as severe epigastric pain radiating to the back. Use the mnemonic GET SMASHED to recall the etiologies:
Gallstones | Ethanol | Trauma | Steroids | Mumps | Autoimmune | Scorpion Stings | Hyper (Lipids/Calcemia) | ERCP | Drugs
Activity
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