What are Centrioles ! Biological Sciencess !!

Centrioles

They are minute submicroscopic subcylindrical structures of 300-500 nm length and 150 nm diameter and usually occur in pairs (diplosome) inside a
specialized fibrous cytoplasm called centrosphere.

The complex is called centrosome
or central apparatus. Each centriole has a whorl of nine triplet fibrils with
interconnections amongst adjacent triplets (called C-A linkers) as well as with a central
hub through spokes. Thus show 9 ÷ 0 organisation.

Centrioles are surrounded by massules or nucleating centre or pericentriolar satellites for formation of new centrioles. Centrioles are required to form basal bodies, cilia, flagella and spindle poles.

They occur in most animal cells except some protozoan protests like Amoeba,
common in flagellate forms (e.g., many green algae, bryophytes, pteridophytes and
cycads).

Centriole is rich in tubulin, ATP. Centrioles are basically locomotory structures and their role in cell division to form spindle is secondary.

Basal bodies or basal granules or blepharoplasts are microcylinders that lie below the plasmalemma at the base of flagella and cilia. The structure is exactly similar to centriole.

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