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insect body wall - strcture and their function
- 1. Insect bodywall – Integument/Exoskeleton External covering – ectodermal in origin Rigid, flexible, lighter, stronger and variously modified Integument....
- 2. Consists of3 layers : Structure
- 3. Outer non-cellular layer– has 2 sub-layers Epicuticle: outer most layer – very thin – devoid of chitin Differentiated into 5 layers: Cement layer – outer most layer – made of lipid and tanned protein – protects wax layer. Wax layer – contains closely packed wax molecules – prevents desiccation Cuticulin – Non-chitinous polymerised lipoprotein layer – barrier to ions Outer Epicuticle Inner Epicuticle (It contain wax filaments) Cuticle....
- 4. Procuticle –divided into 2 – Outer exocuticle & Inner Endocuticle. Exocuticle: Outer layer – much thicker – composed of Chitin & Sclerotin – Dark and rigid Endocuticle – Inner layer – thickest layer – made of chitin & Arthropodin – Colourless, soft and flexible. Epidermis: Inner unicellular layer resting on basement membrane – Functions: Cuticle secretion Digestion and absorption of old cuticle Wound repairing Gives surface look
- 6. Composition.... Chitin: Mainconstituent of cuticle Nitrogenous polysaccharide and polymer of N-acetylglucosamine. (water insoluble and soluble in acids, alkalies and organic solvents) Arthropodin: Untanned cuticular protein (water soluble). Sclerotin : Tanned cuticular protein (water insoluble). Resilin: Elastic cuticular protein – for flexibility of sclerites.
- 7. Cuticular ingrowth of body wall – provide space for muscle attachment. 2 types: Apodeme – hollow invagination of body wall (ridge like) Apophysis – Solid invagination of body wall (spine or fingure like) Endoskeleton...
- 8. 2 types: CuticularAppendages... Non- cellular Cellular Multi-cellular Uni-cellular
- 9. Non-cellular : haveno epidermal association but rigidly attached. Eg: minute hairs & thorns Cellular: have epidermal association
- 10. Unicellular.... Clothing hairor plumose hair : Honey bees Bristles : Flies Scales – Flattened outgrowth of body wall: Butterflies & Moths Glandular seta : Caterpillar Sensory seta: Seta – hair like outgrowth Setae forming cell – Trichogen Socket forming cell – Tormogen Study of arrangement of seta - Chaetotaxy
- 11.
- 12. Multi-cellular... Spur –movable structure : Eg: Delphacidae Spine – Immovable structure:
- 13. Wax glands: Honey bees & mealy bugs Lac gland : lac insect Moulting gland secreting moulting fluid Androconia or scent gland : moth Poison Gland : Slug caterpillar Glands....
- 14. Acts asexternal armour and strengthens external organs Protects the organs against physical aberration, injurious chemicals, parasites, predators and pathogens Internally protects vital organs Provides space for muscle attachment Gives shape to the body Prevents water loss Cuticular pigments give color Helps in sensing the environment Functions...