- The cytoskeleton is the internal framework of the animal cell. The different types of cytoskeleton are actin filaments, intermediate filaments, and microtubules. Their fundamental role is for controlling cell shape, maintaining intracellular organization, and for cell movement.
- Some animal cells have specialized structures, such as flagella and cilia, involved in locomotion. Flagella are long, slender, whip-like extensions that enable cells to move by propulsion. Aside from movement, certain flagella are used for sensation and signal transduction (e.g. in rod photoreceptor cells of the eye, olfactory receptor neurons of the nose, and kinocilium in the cochlea of the ear). Cilia are hair-like projections on the surface of certain cells. The epithelial cells of the lungs are an example of an animal cell with cilia
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