The Cytoskeleton The cytoskeleton extends throughout the cytoplasm It organises cell structure and activities, anchoring many organelles in place It provides mechanical support, maintaining the cells shape: it?s domed in shape and stabilised by opposing forces It is also very dynamic, and can be dismantled and reassembled quickly, to change the shape of the cell Form The cytoskeleton is a network of fibres, the molecular structures include: Microtubules: the thickest of the fibres at 25nm (15nm lumen) Microfilaments: the thinnest of the fibres at 7nm Intermediate filaments: range in diameter from 8?12nm, larger than microfilaments but smaller than microtubules Roles