الرئيسية
Entamoeba histolytica
E. olytica is a pathogenic amoeba. There are trophozoit cyst stages in its life cycle. Only the mature cyst (with 4 nucl infective. Men get infection by mouth. The amoebae inhabit the colon. They multiply by binary fission. The cysts passout with The life cycle of E.histolytica is cyst--trophozoite--cyst. The trophozoites may invade the intestinal wall or even liver and lung tissues by blood dissemination and induce pathological changes.
I.Morphology
There are 4 distinct stages in its life cycle; trophozoite, precyst, cyst, and metacyst, but only the morphology of trophozoite and cyst possess morphologic characteristics that have diagnostic value.
A. ophoite - active form.a.ize trophozoites vary in size from -60 micrometers in diameterb. Movement is by means of a pseudopodium, which is a cytoplasmic protrusion. The characteristics of pseudopodia of Entamoeba histolytica are: (1) broad or finger-like in form (2) thrust out quickly (3) pseudopodium first formed with hyaline ectoplasm, then the granular endoplasm flows slowly into pseudopodium when amoeba move (so called amoeba movement). (4) motility is progressive and directional c. Red blood cells may be found in the endoplasm. d. Nucleus, vesicular type: The nucleus is not visible in anunstained specimen, but when
E. olytica is a pathogenic amoeba. There are trophozoit cyst stages in its life cycle. Only the mature cyst (with 4 nucl infective. Men get infection by mouth. The amoebae inhabit the colon. They multiply by binary fission. The cysts passout with The life cycle of E.histolytica is cyst--trophozoite--cyst. The trophozoites may invade the intestinal wall or even liver and lung tissues by blood dissemination and induce pathological changes.
I.Morphology
There are 4 distinct stages in its life cycle; trophozoite, precyst, cyst, and metacyst, but only the morphology of trophozoite and cyst possess morphologic characteristics that have diagnostic value.
A. ophoite - active form.a.ize trophozoites vary in size from -60 micrometers in diameterb. Movement is by means of a pseudopodium, which is a cytoplasmic protrusion. The characteristics of pseudopodia of Entamoeba histolytica are: (1) broad or finger-like in form (2) thrust out quickly (3) pseudopodium first formed with hyaline ectoplasm, then the granular endoplasm flows slowly into pseudopodium when amoeba move (so called amoeba movement). (4) motility is progressive and directional c. Red blood cells may be found in the endoplasm. d. Nucleus, vesicular type: The nucleus is not visible in anunstained specimen, but when
