anatomy of the pancreas - oluwadiya.comoluwadiya.com/documents/anatomy/abdomen/7 anatomy... ·...
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Anatomy of The Pancreas
Prof. Oluwadiya KS
www.oluwadiya.sitesled.com
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introduction
• The pancreas is both an exocrine gland, producing pancreatic juice that is secreted into the duodenum for digestion, and an endocrine gland, producing insulin and glucagon that are released as hormones into the blood
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Parts of the Pancreas
i. Head of pancreas lies within the C-shaped concavity of the duodenum;
ii. Uncinate (hooklike) process projects from the lower part of the head. It passes posterior to the superior mesenteric vessels
iii. Neck of pancreas is anterior to the superior mesenteric vessels, and, posterior to the neck of the pancreas, the superior mesenteric and the splenic veins join to form the portal vein;
iv. Body: Which links the neck to the tail. It is related to the splenic vessels, which supliesit.
v. Tail of pancreas ends as it passes between layers of the splenorenal ligament.
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Introduction
• Located in epigastric & left hypochondriac regions
• Lies retroperitoneally at approximately T-12/L-1 to L-3
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The Pancreas in situ
Right lobe of liver
Falciform ligament
Gallbladder
Pancreas
Duodenum
L-3
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• Head fills concavity of duodenum
• Body crosses left kidney
• Tail reaches hilus of the spleen
• Related anteriorly to transverse colon
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Uncinate process
• Lies posterior to SMA and SMV
• Lies anterior to aorta and the inferior vena cava
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The Neck
• This is the site of passage of the superior mesenteric vessels behind the pancreas
• Lies anterior to Superior Messenteric Vessels and beginning of the portal vein
• Pylorus is just above
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The Body
• Related posteriorly to the aorta, the origin of the superior mesenteric artery, the left crus of the diaphragm, the left kidney and its vessels, the left adrenal gland, and the splenic vein
Celiac Axis (trunk, artery) lies superior to body
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The Body
• The anterior surface of the body of the pancreas is covered by the double layer of peritoneum of the omental bursa that separates the stomach from the pancreas
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Landmark structures
Splenic Artery:
• Branch of celiac trunk
• Passes right to left
• Course is along upper margin of body and tail
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Landmark structures
Hepatic Artery:
• Branch of celiac trunk
• courses left to right
• along upper margin of neck and head
Superior Mesenteric Artery: at its origin from aorta, posterior to the body of pancreas
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Landmark structures
Splenic Vein: • Runs parallel to artery
• On posterior surface of pancreas
• Terminates in portal vein
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Landmark structures
Superior Mesenteric Vein:
• Passes deep to pancreas
• Merges with splenic vein to form the portal vein
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Arterial Supply to Pancreas
Common Hepatic Artery
Proper Hepatic Artery
Superior Mesenteric Artery
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Landmark structures
Common Bile Duct:
• Passes behind first portion of duodenum
• Then through head of pancreas
• Terminates at ampulla of vater
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Lymphatics from head of pancreas
• Drain to celiac nodes
• Metastases may follow lymph drainage
• Metastases may spread via lesser omentum to liver
• Some terminate in lumbar nodes
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Body & Tail of Pancreas
Have three surfaces:
Anterior surface
1. Concave
2. Deep to stomach
3. Separated from stomach by lesser sac of peritoneum
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Anterior surface of pancreas
Anterior surface of pancreas
Epiploic foramen
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Body & Tail of Pancreas
Posterior surface: separated from vertebrae by
• Aorta
• Splenic vein
• Left kidney and renal vessels
• Left adrenal gland
• Left Crus of diaphragm
• SMA and SMV
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Body & Tail of Pancreas
Inferior surface
• Rests on duodeno-jejunal flexure
• Left extremity (tail)
i. Rests on splenic flexure
ii. Abuts hilus of spleen
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Pancreatic Duct System
Main Pancreatic Duct (of Wirsung)
o Begins at the tail
o Course is left to right
o Receives numerous small ducts
o At the neck of pancreas, duct turns inferior, posterior & to the right
o joins CBD at Ampulla of Vater 7-10 cm below pylorus
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Duct of Wirsung (Main pancreatic duct)
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Duct of Wirsung
Duct of Wirsung
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Pancreatic Duct System
Duct of Santorini:
Accessory pancreatic duct
Not universally identified
Joins duodenum at minor papilla
Part of duct from dorsal pancreas
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Duct of Santorini
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Blood supply of the Pancreas
• Head is supplied:
i. Superior pancreaticoduodenal artery
ii. Inferior pancreaticoduodenal artery
• Body and tail are supplied by branches from the splenic artery
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Arterial Supply: Anterior view
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Arterial Supply: Posterior view
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Lymphatic drainage
• The pancreatic lymphatic vessels follow the blood vessels to:
i. Pancreaticosplenic lymph nodes along the splenic artery.
ii. Pyloric lymph nodes.
• Efferent vessels from these nodes drain to the
i. Superior mesenteric lymph nodes or to the
ii. Celiac lymph nodes via the hepatic lymph nodes.
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Lymphatic drainage