Anatomy of Silkworm Bombyx mori L Dr Mahesha

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 01 March 2021 http: //hbmahesh. weebly. com 1

ANATOMY The branch of science concerned with the bodily structure of humans, animals, Insects and other organisms, especially as revealed by dissection. 01 March 2021 http: //hbmahesh. weebly. com 2

Overall Morphology and Anatomy of Silkworm Larva Dorsal Blood Vessel Tracheal Bushes 01 March 2021 http: //hbmahesh. weebly. com 3

Bombyx mori DORSAL SIDE LATERAL SIDE VENTRAL SIDE 01 March 2021 • • • major organs and tissues under skin Dorsal vessel Muscles Fat bodies Alimentary canal Tracheae Gonads Silk glands Endocrine glands Nerve chord etc. , http: //hbmahesh. weebly. com 4

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Alimentary Canal - Has three layers Inner Tunica Intima Middle Epithelial Outer Muscular 01 March 2021 http: //hbmahesh. weebly. com 6

Fore Gut Pharynx Oesophagus Cardiac Valve Mouth / Oral Aperture The fore gut has a inner chitinous lining protects mechanical damage due to food particles 01 March 2021 http: //hbmahesh. weebly. com 7

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 01 March 2021 http: //hbmahesh. weebly. com 8

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 01 March 2021 http: //hbmahesh. weebly. com 9

EXCRETORY SYSTEM Malpighian Tubules (white colour) 01 March 2021 http: //hbmahesh. weebly. com 10

EXCRETORY SYSTEM continued Malpighian Tubules picks up ammonium ions from Small Intestine aemolymph and converts as uric acid; releases in to rectum Colon 01 March 2021 http: //hbmahesh. weebly. com 11

RESPIRATORY SYSTEM 01 March 2021 http: //hbmahesh. weebly. com 12

Silkworm External Morphology showing SPIRACLES SPIRACLE ENLARGED PERITREME OPENING SIEVE PLATE 01 March 2021 http: //hbmahesh. weebly. com 13

RESPIRATORY SYSTEM SHOWING THE TRACHEAL DISTRIBUTION 01 March 2021 http: //hbmahesh. weebly. com 14

Diagram showing the distribution of trechea and movement of gas 01 March 2021 http: //hbmahesh. weebly. com 15

CIRCULATORY SYSTEM 01 March 2021 http: //hbmahesh. weebly. com 16

Dorsal Blood Vessel (Gray Colour) 01 March 2021 http: //hbmahesh. weebly. com 17

Heart and Aorta with alary muscles Dorsal Blood Vessel showing the movement of blood 01 March 2021 http: //hbmahesh. weebly. com 18

SILK GLANDS 01 March 2021 http: //hbmahesh. weebly. com 19

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OVERALL FEMALE REPRODUCTIVE SYSTEM Bursa Copulatrix Mucus Gland Ovipositor 01 March 2021 http: //hbmahesh. weebly. com 21

FEMALE REPRODUCTIVE SYSTEM ENLARGED 01 March 2021 http: //hbmahesh. weebly. com 22

MALE REPRODUCTIVE SYSTEM 01 March 2021 http: //hbmahesh. weebly. com 23

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 is a mass of Neurons 01 March 2021 http: //hbmahesh. weebly. com 24

Ocelli , antennae & labrum (Mandible, Maxillary & Labial) Enlarged 01 March 2021 http: //hbmahesh. weebly. com 25

Acknowledgements to 1. 2. 3. 4. Sericulture Manual II, FAO, Rome, 1987. The Principles of Insect Physiology by V B Wiggelesworth 1972. The silkworm – A Laboratory Tool by Y Tazima 1979. Internet. 01 March 2021 http: //hbmahesh. weebly. com 26