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    From Digestive System

    Upper Esophageal Sphincter
    Muscle ring that controls entry into the esophagus.
    Abdominal Cavity
    The abdominal cavity is the largest body cavity, housing vital digestive and excretory organs, lined by the peritoneum and essential for protection, metabolism, and organ movement.
    Left Lobe
    Smaller lobe of the liver.
    Cardia
    Upper opening of the stomach.
    Esophagus
    Muscular tube conveying food from the pharynx to the stomach.
    Internal Anal Sphincter
    Involuntary muscle around anal canal.
    Cecum
    First part of large intestine.
    Lower Esophageal Sphincter
    Muscle at the junction of esophagus and stomach.
    Sigmoid Colon
    S-shaped final segment of the colon.
    Common Bile Duct
    Conveys bile from liver and gallbladder to duodenum.
    Oropharynx
    Middle region of the pharynx behind the oral cavity.
    Tail of Pancreas
    Tapered end of pancreas near spleen.
    Anus
    Opening through which feces are expelled.
    Lesser Omentum
    Connects stomach and liver.
    Greater Omentum
    Fatty fold of peritoneum covering intestines.
    Abdomen
    The abdomen is the body region between the chest and pelvis housing vital digestive, metabolic, and excretory organs, protected by muscular and peritoneal layers.
    Common Hepatic Duct
    Carries bile from liver to bile duct.
    Body
    Main central region of the stomach.
    Caudate Lobe
    Lobe of liver near inferior vena cava.
    Transverse Colon
    Horizontal part of the colon.
    Falciform Ligament
    Connects liver to anterior abdominal wall.
    Ileum
    Final and longest portion of the small intestine.
    Body of Pancreas
    Central elongated portion of pancreas.
    Cystic Duct
    Connects gallbladder to common bile duct.
    Parotid Glands
    Largest salivary glands located near the ear.

    Main Pancreatic Duct

    Reviewed by our medical team

    Primary duct draining pancreatic juices.

    Overview

    The Main Pancreatic Duct, also known as the Duct of Wirsung, is the primary excretory duct of the pancreas. It collects digestive enzymes produced by the pancreatic acinar cells and delivers them to the duodenum, where they participate in the digestion of carbohydrates, proteins, and fats. It plays a critical role in the exocrine function of the pancreas and is a key anatomical structure in both digestive physiology and pancreatic diseases.

    Location

    The main pancreatic duct is located within the substance of the pancreas, extending from its tail to its head. Specifically, it:

    • Begins in the tail of the pancreas (in the left upper abdomen, near the spleen)

    • Travels through the body and head of the pancreas

    • Joins the common bile duct in the head of the pancreas

    • Empties into the second part of the duodenum at the major duodenal papilla via the hepatopancreatic ampulla (ampulla of Vater)

    Structure

    The main pancreatic duct is a slender, tubular structure with the following features:

    • Length: Approximately 15–20 cm

    • Diameter: Around 2–3 mm in adults (may vary slightly)

    • Wall: Lined by low cuboidal or columnar epithelium

    • Tributaries: Receives smaller interlobular and intralobular ducts that drain acinar secretions throughout the pancreas

    • Secondary drainage: May be joined by the accessory pancreatic duct (duct of Santorini), which may independently enter the duodenum at the minor papilla

    Function

    The primary function of the main pancreatic duct is to:

    • Transport pancreatic juice: Carries enzyme-rich exocrine secretions from the pancreas to the duodenum

    • Coordinate secretion with digestion: Works in tandem with the bile duct to deliver digestive fluids into the duodenum when food enters from the stomach

    Physiological Role(s)

    The main pancreatic duct plays several key physiological roles in digestion:

    • Enzyme delivery: Delivers pancreatic enzymes (amylase, lipase, proteases) that aid in the breakdown of starches, fats, and proteins

    • pH regulation: Transports bicarbonate ions secreted by pancreatic duct cells to neutralize acidic gastric chyme entering the duodenum

    • Regulated flow: Controlled by the sphincter of Oddi, which coordinates the release of pancreatic and bile secretions during digestion

    Clinical Significance

    Disorders of the main pancreatic duct are associated with several important clinical conditions:

    • Pancreatitis: Obstruction (e.g., gallstones or strictures) of the main pancreatic duct can cause backpressure and lead to acute or chronic pancreatitis

    • Pancreatic ductal dilation: May indicate underlying pathology such as pancreatic tumors, strictures, or intraductal papillary mucinous neoplasms (IPMNs)

    • Main Duct IPMN: A pre-cancerous mucinous tumor that involves the main duct and increases the risk of invasive pancreatic cancer

    • Pancreatic divisum: A congenital anomaly in which the dorsal and ventral ducts fail to fuse, resulting in inadequate drainage through the main duct

    • ERCP and imaging: Endoscopic retrograde cholangiopancreatography (ERCP) and MRCP (magnetic resonance cholangiopancreatography) are used to visualize the duct and diagnose obstructions, leaks, or tumors

    • Surgical importance: The duct’s integrity is vital during procedures like pancreaticoduodenectomy (Whipple procedure) and pancreatic resections

    Dysfunction or blockage of the main pancreatic duct can lead to serious digestive and metabolic complications. Early diagnosis and appropriate management are essential to preserve pancreatic function and prevent irreversible damage.

    Did you know? The body absorbs over 90% of the nutrients from the food you eat in the small intestine.