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By Jack Loren
September 14, 2023
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Centrioles are two spindle-shaped or cylindrical bodies that lie at the right angle to each other and are surrounded by a zone of hyaline cytoplasm, the centrosphere
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hese are present near the nucleus and mostly occupy an apical Position.
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Centrioles are found in most algae, bryophytes, ferns, and in all animal cells.
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Red algae, gymnosperms, and angiosperms as also the non flagellated and nonciliated protozoans do not have centrioles.
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The structure of the centriole is basically the same in all the cells.
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Its size varies from 150-250 nm (1500-2500 Å) in diameter and 3000-20000 Å in length.
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A centriole is formed of nine triplets or microtubules or fibres.
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These are arranged equidistant in a circle around an imaginary central axis.