Pancreas of N. kaiseri. (11) Pancreas is a triangular organ and it’s situated in the curvature of duodenum. (12) Its composed of numerous masses of exocrine acini (black arrow) which secret digestion enzyme. Langerhounse Island (white arrow) is also present (H&E, ×1000). (13) Acini (arrow) is enzyme secreting units of exocrine portion of pancreas. Each acinius is an ovoid elliptical cluster of pyramid-shaped secretory cells surrounding the lumen. In the apical portion of the cells these are aggregated bright eosinophilic zymogens granules. The round or flattened cell nuclei are located basally (H&E, ×4000). (14) Pancreatic acini drain into a branched system of variously sized ducts. In this Image the duct (arrow) is surrounded by a simple cuboidal epithelium (H&E, ×2500).