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Published byDarcy Gaines Modified over 9 years ago
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Flagellum first discovered by Englemann(1887) Jansen (1887):- report structure of flagellum of sperm. Hodge (1950):- detailed ultra structure of flagellum of spermatozoa Manton :-gave ultra-structure of cilia
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Cilia and flagella are microscopic, hair or thread like motile structures present extra- cellularly but originate intra-cellularly from the basal body and help in movements, locomotion, feeding, circulation etc.
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Central tubules are formed of dynein protein. Peripheral microtubules formed of tubulin protein Interdoublet linkers formed of nexin protein. Quantitatively it is formed of:- 1. Proteins =74-84% 2. Lipids=13-23% 3. Carbohydrates=1-6% 4. Nucleotides=0.2-0.4%
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Arise from basal bodies. Similar in ultra structure. Similar chemical composition. Similar in basic function.
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Cilia More in number (14,000/ cell). Small size(5-10 micro meter). Distributed on whole body Beat in either metachronous or synchronous coordination. Sweeping or rowing motion. Locomotion, feeding, circulation etc are its function. Flagella Less in number(1-8), but many in Trichonympha. Large size(150 micro meter). Located at anterior end of body. Beat independently. Undulatory motion. Only locomotion.
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Locomotion Cilia of Paramecium and flagella of collar cells of sponges maintain nutritive-cum-respiratory water current. Cilia of wind pipe expel out any dust or food particle. Cilia of kidney-nephrons move nephric filtrate. Help in conjugation in Paramecium Flagella circulates the food in coelenterons. Cilia of larval forms help in their dispersal.
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