🧬 Chapter 395: Embryology, Anatomy, and Physiology of the Pancreas

Nelson Textbook of Pediatrics 22nd Edition — Pancreatic development: Dorsal and ventral buds fuse at 6-7 weeks. Annular pancreas (ventral bud encircles duodenum), pancreas divisum (failure of fusion). Exocrine pancreas: Acinar cells secrete digestive enzymes (trypsinogen, amylase, lipase) in response to CCK; ductal cells secrete bicarbonate (secretin). Endocrine pancreas: Islets of Langerhans (beta cells → insulin, alpha cells → glucagon).

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📋 30 Clinical Scenarios — Pancreatic Embryology, Anatomy & Physiology

📇 High‑Yield Review Cards (Pancreas)

🩺 Clinical Correlations: Pancreatic Development & Function

Select a presentation for embryologic/anatomic basis and management.

📋 Stepwise Approach to Pancreatic Structural/Functional Abnormalities

🔑 Key Principles — Pancreas (Nelson Ch.395)
• Dorsal pancreatic bud: Forms body, tail, part of head (larger).
• Ventral pancreatic bud: Forms remainder of head, uncinate process, main pancreatic duct (Wirsung).
• Pancreas divisum: Failure of fusion → majority drains through small duct (Santorini) → may predispose to recurrent pancreatitis.
• Annular pancreas: Ventral bud encircles duodenum → duodenal obstruction (neonate or adult).
• Exocrine function: Acinar cells secrete zymogens (trypsinogen, chymotrypsinogen). Ductal cells secrete bicarbonate (CFTR-dependent).
• Stimuli: CCK (acinar, amino acids/fat), secretin (ductal, acid).
• Pancreatic insufficiency: Occurs when lipase secretion <10% of normal.

    ⚡ Reflex Prompts — Pancreatic Clinical Correlations

    📖 Pancreatic Embryology, Anatomy, Physiology — Core Summary