Final answer:
Animal cells contain centrioles and a centrosome in their cytoskeleton, which are not found in plant cells. The centrosome is a microtubule-organizing center, including centrioles, vital for cell division.
Step-by-step explanation:
The structures of the cytoskeleton that are found in animal cells but not in plant cells are centrioles and the overall structure called the centrosome. Animal cells each have a centrosome and lysosomes, which are not typically present in plant cells. On the other hand, plant cells have components such as the cell wall, chloroplasts, and a large central vacuole that are absent in animal cells.
The centrosome is a microtubule-organizing center that includes a pair of centrioles, often located near the nucleus of animal cells. These centrioles are cylindrical structures composed of nine triplets of microtubules and are crucial for various cell activities, including the facilitation of cell division.