Centrioles are a very important part of centrosomes, which are involved in organizing microtubules in the cytoplasm.  The position of the centriole determines the position of the nucleus and plays a crucial role in the spatial arrangement of the cell. (excerpt from wikipedia)

Detail of an image which appeared in Journal of Ultrastructure Research Volume 57, Issue 1, October 1976, Pages 43-53 (link) by Manley McGill

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