Illustration of Cell Structure: Centrioles

Illustration of Cell Structure: Centrioles
By Russell Kightley Media

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.