Histological and histochemical studies on digestive system of Pinna (Atriina) pectinata

The structure and function of digestive system of Pinna (Atriina) pectinata Linnaeus were studied using histological and histochemical methods. The epithelium of the digestive tract is composed of columnar ciliated cells, goblet cells (mocous cell), and eosinphilic cell only the epithelium of labial palp, mid-gut and ascending limb intestine. The epithelium of digestive diverticula consists of secretory cells and digestive (absorptive) cells. Many blood spaces present the subcutaneous connective tissue, and granular cells exist the connective tissues and blood spaces. The epithelium of esophagus, stomach, mid-gut, style sac and digestive diverticula can produce the digestive enzymes which involved the digestion and absorption of food particles, and the connective tissues and granular cell also participate the digestion and absorption of food. Ferric ion is present the epithelium of labial palp, esophagus, mid-gut and style sac,and granular cell in the connective tissues. Calcium exists the connective tissue.