Explain the digestive system of cockroach.

Explanation

The digestive system of cockroach consists of the alimentary canal and Salvary gland - digestive glands. The alimentary canal Salivary is present in the body cavity and is reservoir divided into three regions: foregut, esophagus midgut and hindgut (Figure). The foregut includes pre-oral cavity, mouth, pharynx and oesophagus. This in tum opens into a sac like structure called Gizzard - the crop which is used for storing food. Then is follows the mizando Hepatic caecaproventriculus which has an outer layer of thick circular muscles and thick inner Mesonderen cuticle forming six highly chitinous or midgut plates called "teeth". Gizzard helps in Malpighian Rectum the grinding of the food particles. The tubules midgut is a short and narrow tube behind cum the gizzard and is glandular in nature. Colon At the junctional region of the gizzard are cight fingers like tubular blind processes called the hapatic caecae or enteric caecae. The hindgut is marked by the presence of 100 - 150 yellow coloured thin filamentous malphigian tubules which are helpful in removal of the excretory products from the haemolymph. The hindgut is broader than the midgut and is differentiated into ileum, colon, and rectum. The rectum opens out through the anus.
Digestive glands of cockroach consist of the salivary glands, the glandular cells and hepatic caecae. A pair of salivary glands is found on either side of the crop in the thorax. The glandular cells of the midgut and hepatic or gastric caecae produce digestive juices.