1. Diagram of alimentary and digestive
glands in cockroach.
What are functions of these glands.

3. • 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

4. Forgut
• It is composed of 4 parts.
• 1/mouth cavity
• 2/ pharynx
• 3/ crop
• 4/ gizzard

6. Salivary Glands
• One pair is located in thorax region.
• These glands secrete saliva which gets poured
in to mouth cavity.

7. 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.

8. 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.

9. 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.

10. Crop
• Partly digested food is stored in the crop.
• Food leaves the crop chunk by chunk

11. Gizzard
• Partly digested food gets grounded in the
gizzard.
• Then food goes to midgut

12. Role of hepatic caecae
• They secrete enzymes

13. In the mid gut
• Secretion of hepatic caecae and mid gut digest
food in midgutcompletely.

14. Rectum
• It’s a place of temporary storage for
indigestable food.

15. Anus
• Faecal matter is expelled through an opening
called anus

16. Tubular digestive system
• It is more advanced than sac like digestive
system.
• In this system there are specialised organs or
partitions.
• That is why digestion and absorption is
efficient.