Alimentary Canal of Cockroach :

Alimentary Canal of cockroach :

The alimentary canal is in the form of tube  present in the body cavity

Alimentary canal of cockroach is  divided into three regions are as follows:

1.  Fore gut

2.  Mid gut

3.  Hind gut.

Fore gut- it is also called as stomodaeum. It consists of mouth, pharynx, oesophagus, crop chamber and gizzard.

The mouth is present to the anterior end which opens into a short tubular pharynx, leading to a narrow tube called oesophagus.

 The oesophagus leads into large sac like structure called crop. Crop is used for storing of food.

The crop is followed by gizzard. It has rounded highly muscular part. The lumen of crop chamber shows presence of Six  chitinous teeth. Gizzard helps in grinding the food particles.

At the junction of fore gut and mid-gut there is presence of 6-8 blind tubules called hepatic or gastric caecae which secrete digestive juice.

Mid-gut –It is in the form of elongated and coiled tube.  The digestion and absorption of food takes place in this part.  

Hind gut – it is also called as proctodium. It is coiled and pigmented part of alimentary canal.  The hindgut consist of  ileum, colon and rectum.

At the junction of mid-gut and hind-gut there is presence of ring of 100-150 yellow coloured thin filamentous Malpighian tubules. The malpighian tubules are the most important part of excretory system, help in removal of nitrogenous waste from the haemo-lymph.

The rectum is most posterior part of alimentary canal. The undigested food is temporarily  stored into the rectum.