. Animal parasites and human disease. Parasites; Medical parasitology; Insects as carriers of disease. 120 INTESTINAL FLAGELLATES AXD CILIATES be a modified parabasal body: in some forms it is broken up into a row of chromatinic granules. At the point of insertion of the flagella. and serving as the center of the neuromotor apparatus is a basal granule or blepharoplast. Arising near the anterior end and running through the body is a sort of supporting rod called the •" ; which, according to Kofoid and Swezy. is also used as an organ of locomotion. At the anterior end at one
. Animal parasites and human disease. Parasites; Medical parasitology; Insects as carriers of disease. 120 INTESTINAL FLAGELLATES AXD CILIATES be a modified parabasal body: in some forms it is broken up into a row of chromatinic granules. At the point of insertion of the flagella. and serving as the center of the neuromotor apparatus is a basal granule or blepharoplast. Arising near the anterior end and running through the body is a sort of supporting rod called the •" ; which, according to Kofoid and Swezy. is also used as an organ of locomotion. At the anterior end at one side of the point where the flagella originate is a slight depression or " cytostome "" winch serves as a mouth. The small round nu- cleus lies in the body just behind the origin of the flagella. Trichomonas swims by active lashing movements of the free flagella and by wave motions of the undulating membrane. The body revolves as the animal wends its way through the semi-liquid substances in which it lives. Multiplication is by longitudinal division of the body, the flagella and undulating membranes and internal structures all being duplicated before the animal splits into two. A process of multiple fission resulting in the formation of eight individuals has also been described. Encystment, such as occurs in other Intestinal protozoans. has definitely been observed only recently in Trichomonas. Some of the flagellates, after escaping from the body with the faeces, soon degenerate, gradually losing all their append- g - except the undulating membrane. With- out their flagella. and with their ameboid movements, these animals closely resemble amebse but can usually be identified by the undulating movement which p rsist£ t one side of the body. Others, without losing Fig. 3i. Trichc « th { appendages, become round and mo- intestxnahs; A. pre-encyst- ... ment stage; B, encysted tionleSS as if in a CVSt. but with no C Ell L™"h) X 24°°* (After wal1 around t
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1922
