Digestive system - 3 Pictures from MedAtlas version 3,0 simple columnar epithelium lymmph nodule lymph nodule crypt bileduct liver sinusoid sheets of hepatocytes liver parenchyma adventitia mucosal folds mucosa outer muscle layer interlobular duct acini islets of Langerhans acini centroacinar cells serous cells intercalated duct acini Pancreas – islet of Langerhans blood sinusoid cords of endocrine cells Hepar – Kupffer cells