1. Anatomy of Silkworm Bombyx mori L.
Dr. Mahesha H B
Associate Professor and Head
Department of Sericulture
Yuvaraja’s College
University of Mysore, Mysuru, India
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2. ANATOMY
The branch of science concerned with the bodily structure of humans, animals, Insects and other organisms, especially as revealed by dissection.
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3. Overall Morphology and Anatomy of Silkworm Larva
Dorsal Blood
Vessel
Tracheal Bushes
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4. Bombyx mori major organs and tissues under skin
Dorsal vessel
Muscles
Fat bodies
Alimentary canal
Tracheae
Gonads
Silk glands
Endocrine glands
Nerve chord etc.,
DORSAL SIDE
LATERAL SIDE
VENTRAL SIDE
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6. Alimentary Canal - Has three layers
Inner Tunica Intima
Middle Epithelial
Outer Muscular
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7. Fore Gut
Pharynx
Oesophagus
Cardiac Valve
Mouth / Oral Aperture
The fore gut has a inner chitinous lining protects mechanical damage due to food particles
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8. Mid Gut
Digestion and Absorption
Goblet Cells at midgut Epithelium Secretes digestive Fluid
Cylindrical cells absorb digested food
Inner peritrophic membrane in the mid-gut generally protects the mid-gut epithelium
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9. Hindgut Consists Small Intestine, Colon and Rectum.
Pylorus Valve guards and regulates the passage of digested food
The hind gut have a chitinous lining protects mechanical damage due to food particles
Rectum has six muscles (Rectal Pads). The faecal matter is pressed in the rectum and expelled from the anus as faecal pellets bearing haxagonal marks.
Silkworm Excreta With Hexagonal Shape
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10. Malpighian Tubules (white colour)
EXCRETORY SYSTEM
EXCRETORY SYSTEM
Malpighian Tubules (white colour)
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11. EXCRETORY SYSTEM continued
Malpighian Tubules picks up
ammonium ions from
aemolymph and converts as
uric acid; releases in to rectum
Small Intestine
Colon
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12. RESPIRATORY SYSTEM
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13. SPIRACLE ENLARGED PERITREME OPENING SIEVE PLATE
Silkworm External Morphology showing SPIRACLES
SPIRACLES
SPIRACLE ENLARGED
PERITREME
OPENING
SIEVE PLATE
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14. RESPIRATORY SYSTEM SHOWING THE TRACHEAL DISTRIBUTION
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15. Diagram showing the distribution of trechea and movement of gas
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16. CIRCULATORY SYSTEM
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17. Dorsal Blood Vessel (Gray Colour)
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18. Heart and Aorta with alary muscles
Dorsal Blood Vessel showing the movement of blood
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19. SILK GLANDS
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21. OVERALL FEMALE REPRODUCTIVE SYSTEM
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22. FEMALE REPRODUCTIVE SYSTEM ENLARGED
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23. MALE REPRODUCTIVE SYSTEM
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24. NERVOUS SYSTEM NS of silkworm can be studied under three sub divisions as
CENTRAL Nervous System
1. CENTRAL Nervous System
2. VISCERAL Nervous System
3. PERIPHERAL Nervous System
Ganglion
Ganglion is a mass of
nerve cell bodies (Neurons)
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25. Enlarged 27 November 2018 http://hbmahesh.weebly.com
(Mandible, Maxillary & Labial)
Enlarged
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26. Acknowledgements to 1. Sericulture Manual II, FAO, Rome, 1987. 2
Acknowledgements to 1. Sericulture Manual II, FAO, Rome, The Principles of Insect Physiology by V B Wiggelesworth The silkworm – A Laboratory Tool by Y Tazima Internet.
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