Cytoskeleton – It is a cellular "scaffolding" or "skeleton" contained within the cytoplasm it is composed of three types of fibers: microfilaments, intermediate filaments, and microtubules. Cytoplasm – A gelatinous, semi-transparent fluid that fills most cells, it includes all cytosol, organelles and cytoplasmic inclusions. Cytosol – It is the internal fluid of the cell, and where a portion of cell metabolism occurs.