Some white blood cells (WBCs) like macrophages and leukocytes in the blood can be seen to exhibit amoeboid movement. The formation of pseudopodia is characteristic of this type of movement. In addition to this, some cytoskeletal elements like microfilaments are also involved in the amoeboid movement. Ciliary movement in humans is only observed in internal tubular organs which are lined by ciliated epithelium. Some examples of ciliary movement can be seen in the trachea and the female reproductive tract.