3) Oesophagus: Buccal cavity opens into oesophagus. It is long tube. At the junction of oesophagus & buccal cavity two oesophageal cavities are present. They show salivary glands.
- Anterior part of the stomach is connected with oesophagus. Around this digestive glands are present.
- The posterior part of stomach is called pyloric stomach. It shows a blind caecum.
5) Intestine: Stomach leads into intestine. It is coiled. It leads into rectum.
- Buccal glands
- Salivary glands
- Digestive gland (or) Hepatopancreas.
- Buccal glands: In the buccal cavity wall these glands are present. They secrete a juice whose function is not clearly known.
- Salivary glands: They are present in the two oesophageal cavities. They give salivary ducts. They open into buccal cavity. The enzyme present in this saliva will digest the carbohydrates.
- Hepatopancreas: It is a big gland. It is brown in colour. It occupies bigger part of the visceral mass. In this gland three types of cells are present. They are
a) Secretory Cells: They secrete digestive juices.
b) Intracellular digesting Cells: These cells will perform intracellular digestion.
c) Calcium Cells: These cells will store calcium phosphate.
Digestion 1: Pila takes smaller plants and their leaves as food. With the help of walls of Buccal cavity it will catch the leaves. Radula will cut the leaves into bits. In the buccal cavity this food is mixed with saliva.