Department of Zoology at ANDC/Zoology Museum/Permanent slides/Annelida

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{|cellpadding="5" cellspacing="6" style="width:100%;background:#FFFFFF; border-style:solid; border-width:3px; border-color:#0066FF;" Date & Time : 28, August 2024      
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=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.

ts into lumen of gut,encloses a capillary blood vessel.
 * Typhlosole : poorly developed,represented by median dorsal fold of internal epithelium which projec


 * Other distinct parts : Blood vessel-Dorsal,ventral and subneural, supra intestinal excretory canal,nephridia and ventral nerve cord.