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سؤال في علم الطفيليات محتاج اجابته ضروري

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  • سؤال في علم الطفيليات محتاج اجابته ضروري

    ارجو منكم الاجابة على هذا السؤال في علم الطفيليات ضروري:sm197:
    what is morphological differences between taenia solium and taenia seginata ?
    drowing 3 page
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    التعديل الأخير تم بواسطة a7mad alqahtani; الساعة 10-11-2008, 08:23 PM.

  • #2
    MORPHOLOGY OF T.saginata
    Adults - The adult tapeworms have an average length of ~ 5 meters , consisting of approximately 1000 proglottids, but may grow up to 17 metres in length occasionally, and are therefore longer than the adult forms of Taenia solium. The mature proglottids have approximately double the number of testes that T. saginata has and are larger. The gravid proglottids are also larger, measuring approximately 20mm long by 6mm wide, have a uterus with more lateral branches, less than T. solium. These gravid proglottids when detached from the strobila may be very active, not only crawling away from the faeces when passed, but often actively emerging from the anus to deposit eggs from the ruptured uterus around the perianal region. The scolex in this tapeworm may also be differentiated from T. solium as it is slightly larger, at approximately 2mm in diameter and is unarmed, without any hooks, although the 4 acetabular suckers are still present.



    Morphology

    Larvae - These small cysticerci (refered to as Cysticercus cellulosae) are approximately 6- 18mm wide by 4 - 6mm in length when found in the muscles or subcutaneous tissues (the normal sites for the larval of this parasite). The cysticerci may however be found in other tissues such as those of the central nervous system where they may grow much larger, up to several cm in diameter.

    Adults - The adult tapeworms have an average length of ~ 3 meters, but may grow up to 8 metres in length occasionally, and follow the typical morphology of cestode tapeworms. The strobila consists of between 800 and 1000 proglottids. The mature proglottids having trilobed ovaries with a small central lobe in addition to the two lateral lobes and only approximately half the number of testes that T. saginata has. The gravid proglottids, measuring approximately 12mm long by 6mm wide, have a uterus with between 8 to 12 lateral branches, less than T. saginata. The scolex in this tapeworm may also be differentiated from T. saginata as it is equipped with a low rostellum with a double crown of approximately 30 hooks.



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