Centriole

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A small organelle that can be found in all of the animal cells and few plant cells. It locates near to the nucleus and as a part ofcentrosome. Also, it presents in the form of two cylinders that one of them is mother cenriole and the other one is daugther centriole pair up at the right angle.

Centriole is formed by numbers of microtubule triplet joining together and each three mircotubule triplets as a group. Each group connected by the connecting fibrils. Centriole is one of the example of "9+2" pattern and this pattern can bee seen in the cross section of it. 

The main function of centriole is forming spindle fibres during cell division. In prophase, spindle fibres started forming in centriole and  then appear in centrosome. After that, in prometaphase, spindle fibres attach to the kinetochores in centremeres of chromsomes. Following this, in anaphase, sister chromosomes separated and each of them move to the opposite ends by the attachment of spindle fibres.

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