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Date & Time : 28, December 2024 00:58
T.S. of Earthworm through Pharynx
- Body wall : made of thin cuticle,epidermis(columnar),muscles-both circular and longitudinal.
- Other distinct parts : blood vessel-dorsal and ventral,ventral nerve cord.
- Pharynx : lies in the centre,broad from side to side,narrow and compressed dorsoventrally.
- Pharyngeal bulb : thick, consists of pharyngeal gland cells,muscula vascular tissue and pharyngeal epithelium(ciliated).
- Dorsal salivary chamber : has a roof of ciliated epithelium.
T.S. of Earthworm through Gizzard
- Body wall : made of thin cuticle,epidermis(columnar),muscles-both circular and longitudinal.
- Intersegmental septum : well developed,present around dorsal blood vessel and latero oesophageal vessel.
- Gizzard : occupies major portion of body,hard organ with thick muscular wall andlining of columnar epithelium and internal cuticle.
- Function of Gizzard : masticatory organ,breaks down food into simpler particles.
- Body cavity : greatly reduced.
- Ventral side : contains ventral blood vessel,ventral nerve cord,integumentary nephridia.
T.S. of Earthworm through Typhlosole
- Body wall : made of thin cuticle,epidermis(columnar),muscles-both circular and longitudinal.
- Central region : contains a section of intestine with typhlosole.
- Intestine : made up of outer layer of peritoneal epithelium, muscular fibre layers- both circular and longitudinal,internal epithelial lining of gut.
- Intestinal epithelium : thrown into a numerous folds.
- Typhlosole : poorly developed,represented by median dorsal fold of internal epithelium which projec
ts into lumen of gut,encloses a capillary blood vessel.
- Other distinct parts : Blood vessel-Dorsal,ventral and subneural, supra intestinal excretory canal,nephridia and ventral nerve cord.
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