ORGANELLE DIAGRAM: CENTRIOLES:
In this picture, the centrioles are the two tube-like objects. They are seen very close to the nucleus (the purple crescent at the bottom of the diagram). Centrioles are bundles of microtubules that sit in a grainy region called the centrosome. From the edge of this region, microtubules assemble and project in ray-like fashion to the edges of the cell.
Their central location gives the centrioles (and centrosome) their names.
location: near nucleus at approximate centre of cell.
appearance: tubular bundle of microtubules. There are 2 centrioles in the centrosome.
size: about 500nm in length
function: associated with the centrosome that generates microtubules. During cell division, the centrioles go to opposite sides of the cell and organise the microtubules that drag the chromosomes apart (so that one set each of the duplicated chromosomes end up in each daughter cell).