1 / 12

Digestive system of insect

Digestive system of insect differentiated into 3 main Region.<br>

zubair6
Download Presentation

Digestive system of insect

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Presentation Topic;Digestive system of Insect

  2. Digestive system • It consist of the elimentary canal and the associated glands which help in digestion. • The elimentary canal extend from mouth to the Anus. Digestive system of insect differentiated into 3 main Region. • Foregut(stomodaeum) • Midgut(mesenteron, ventriculus or stomach) • Hindgut (proctodaeum or intestine)

  3. Foregut • Foregut consist of Mouth (oral cavity), pharynx, oesophagus , crop and Gizzard(proventriculus). • Foregut start from mouth cavity into which open in salivary gland.

  4. Foregut Salivary gland • The gland are grape like cluster of circular acini which give their seceretion into two salivary duct. • Two salivary duct unite to form a common salivary duct which open below the hypo pharynx. • The mouth cavity anterior portion of the foregut, the pharynx. • The pharynx forms posteriorly a narrow and curved tube ,the oesophagus. • The oesophagus gradually widen behind to form the large crop which act as a food reservoir.

  5. The crop open into the gizzard. • Gizzard narrow posteriorly and and is not clearly differentiated form the former. • The gizzard is surrounded by the anterior lobes of the gastric caeca. • The junction of foregut and midgut is provided internally with a cardiac valve which regulates the passage of food

  6. Midgut • The midgutis comparatively a short cylindrical and straight tube. • At its anterior and arise six large, elongated sacs, the gastric caeca which are the evagination of its anterior end. • Each gestriccauecum consists of a longer anterior lobe and a shorter posterior lobe.

  7. The posterior lobe are filled with food where as the anterior lobe have only the secretary function. • The midguton its inner side has a very thin peritrophic membrane for the protection of its secretary cells from the friction of the food particles. • This permeable membrane also extends into the hindgut. • The Posterior end of the midgut is marked by the presence of malpighian tubules. • At the junction of the midgut and hindgut is a pyloric valve.

  8. Hindgut • The Hindgut is further differentiated into an ileum, colon and rectum. • The Ileum is a thick and straight tube which narrows posteriorly. • The Colon is a short and narrower tube which dilates posteriorly to merge into the rectum.

  9. The rectum is a wider tube which is extremely provided with six bands of longitudinal muscles alternating with six long rectal pads. • The rectum ends in an anal opening

More Related