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UNIVERSIDAD VERACRUZANA Facultad de Biosnálisis Parasitología General “Helmintos” 09 de octubre de 2022 Equipo 4 Hernández Bautista Dayra Elizabeth Labourdette Calderón Araceli Melchor Cuacua Yahir Rafael Navarro Melchor Julieta Zamudio Sánchez Alicia de los Ángeles Equipo 3 - - - - - Historia de los Helmintos Se interviene en el studio de las parasitosis tropicales, naciendo así la parasitología. Siglo XIX Intervención del microscópio Siglo XVII Avance en la profilaxis y tratamiento efectivo de varias clases de helmintos XXI Galeno hablaba de los gusanos intestinalis del hombre y de algunos animales 130-322 a. C. Los Egipcios describen a las tenias y hacen referencia al tratamiento 1550 a. C. Aristóteles hace una descripción y clasificación de los gusanos intestinales 384-322 ¿Qué son los Helmintos? Helmito, del griego “gusano parasito”, refiere a especies animales de cuerpo largo o blando que infestan el organismo de otras especies. Organismos con grandes diferencias de formas, requerimientos fisiológicos y biológicas. VERMES Son gusanos parásitos y de vida libre. SON INVERTEBRADOS SON PROPIOS DE HOMBRE, PERO PUEDEN CAUSAR ENFERMEDADES EUCARIOTAS MULTICELULARES TAMAÑO: DESDE 1 MM. HASTA 10 M. PUEDEN SER HEMAFRODITAS POSEEN SISTEMA NERVIOSO, EXCRETOR Y REPRODUCTOR. CARECEN DE SISTEMA CIRCULATORIO Y RESPIRATORIO. HUEVO GUSANO ADULTO O LARAVAS Clasificación Tremátodos Acantocéfalos Céstodos Nemátodos PLATELMINTOS Los platelmintos, llamados gusanos planos, son un FILO de ANIMALES invertebrados, que comprende unas 20 000 ESPECIES. La mayoría son HERMAFRODITAS que habitan en ambientes marinos, fluviales, terrestres húmedos y aéreos; SON Carnívoros que presentan triblastia (tres capas de tejido que se desarrollan en su crecimiento embrionario Características Tienen simetría bilateral: es decir, su cuerpo tiene forma de suela y son aplanados. Carecen de cavidad corporal (acelomados o acelómicos) Carecen de sistema circulatorio y respiratorio. El sistema excretor, cuenta como unidad básica con células flamígeras. El sistema nervioso esta formado por un par de ganglios anteriores, de los que parten una serie de cordones nerviosos que se dirigen hacia el extremo posterior, uniéndose entre sí. La mayoría son monoicos (hermafroditas), aunque algunos son dioicos, o lo que es lo mismo con sexo separado. La reproducción es sexual, si bien los estadios larvarios pueden multiplicarse de forma asexual. No tienen cavidades corporales internas: solamente cuentan con conductos digestivos. A estos animales sin cavidad se les denomina acelomados. Presentan interneuronas: son los animales más simples que cuentan con ellas. Pueden parasitar humanos: por lo que tienen una gran importancia médica. Turbellaria especies de vida libre, aunque algunas pueden desarrollar una vida parasitaria en invertebrados, especialmente en equinodermos y moluscos. como la PLANARIA (Dugesia sp.) Monogenea. Son por lo general especies parásitas de peces que se localizan en la piel o agallas, por tanto ectoparásitos. Trematoda Parásitos, como las DUELAS (FASCIOLA HEPATICA) se subdivide en 3 clases Digenea: Suelen ser parásitos del tracto digestivo de vertebrados. Con ciclo evolutivo indirecto, el hospedador intermediario es normalmente un molusco. Aspidogastrea: Por lo general son parásitos de invertebrados, muy pocos lo son de tortugas o peces. Didymozoidea: Parásitos de peces. En muchos casos se desconoce su ciclo biológica 4. Cestoda Cestoidea: Suelen ser parásitos de vertebrados, de ciclo evolutivo 1 indirecto. Los dos grupos de mayor interés veterinario son la superclase Trematoda (Clase Digenea) y la superclase Cestoidea. 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