Diagram of alimentary and digestive glands in cockroach
Diagram of alimentary and digestive glands in cockroach.What are functions of these glands.
• Digestive system of cockroach is of tubular type. It means its in the form of tube. Mouth is for ingestion and anus is for egestion.• It can be divided in to 3 parts.• 1/foregut• 2/ mid gut• 3/hind gut
Forgut• It is composed of 4 parts.• 1/mouth cavity• 2/ pharynx• 3/ crop• 4/ gizzard
Salivary Glands• One pair is located in thorax region.• These glands secrete saliva which gets poured in to mouth cavity.
Midgut• It is short narrow tube.• This tube is called mesenteron stomach.• Hepatic caecae open in to front( anterior) end of mid gut.• Hepatic caecae are short finger like hollow tubes.
Hind gut• It is a long coiled tube.• Last part of tube Is thick walled chamber , called RECTUM.• Rectum opens to exterior(outside) through anus.• Anus also called cloacal aperture.
What happens in the mouth• Cockroach eats all kinds of food.• It cuts food in to small pieces with the help of mandible ( cockroach jaw bone).• Food gets mixed up with saliva in mouth.• Saliva has digestive enzymes.• Digestive enzymes hydrolyse the starchy matter.
Crop• Partly digested food is stored in the crop.• Food leaves the crop chunk by chunk
Gizzard• Partly digested food gets grounded in the gizzard.• Then food goes to midgut