Overview: Extrinsic Glands
- The major extrinsic digestive glands and associated organs are the major salivary glands, pancreas, liver, and gallbladder.
- Extrinsic digestive glands are glands located outside the wall of the digestive tract but connected to it by ducts or associated flow pathways.
- Digestive glands support digestion by sending secretions into the digestive lumen or by producing substances that affect digestion and metabolism.
- Major salivary glands are paired glands that make saliva and deliver it to the oral cavity.
- The pancreas has an exocrine part that releases digestive material into the duodenum and an endocrine part that releases hormones into blood.
- The liver is the largest gland and performs digestive, metabolic, detoxifying, storage, immune, and blood-protein-producing functions.
- Gallbladder stores and concentrates bile made by the liver and releases it into the duodenum.
- Digestive-tract wall means the layered wall of the alimentary canal; extrinsic glands are not embedded inside that wall as their main location.
- Ducts are tubes that carry gland products toward the digestive lumen.
- Digestive lumen is the open internal space where food, chyme, bile, enzymes, or intestinal contents pass.
- Enzymes are proteins that speed chemical digestion of food molecules.
- Buffers are substances that resist changes in acidity and help protect tissues from acid.
- Emulsifiers break large fat droplets into smaller droplets so enzymes can act more effectively.
- Lubricants reduce friction and help food, secretions, and luminal contents move smoothly.
- Hormones are chemical messengers released into blood or local tissue to regulate secretion, motility, hunger, and metabolism.
- Blood proteins produced by digestive glands include liver-made proteins needed for clotting, fluid balance, and transport.
- Exocrine function means secretion through ducts onto a surface or into a lumen.
- Endocrine function means secretion into blood.
- Extrinsic glands are high-yield because they connect histologic structure with major digestive functions: saliva, pancreatic juice, bile, and metabolic regulation.
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