Verified Answer :

Cytoskeleton is a web of proteins in the
cytoplasm. It is the combination all of the microfilaments and microtubules. It
is different from cytosol or cytoplasm. It provides structure providing support
for the whole cell. It extends to every organelle and throughout the cytoplasm
and to every part of the cell membrane.  The
cytoskeleton constitutes 3 portions, these are:

Protein-tubulin or microtubules

Protein-keratin and lamin or the
intermediate filaments

Protein-actin or the actin filaments