The topmost layer comprises stratified squamous epithelium which is bordered by ciliated pseudostratified epithelium. They are lined with respiratory epithelium, which is classified as ciliated pseudostratified columnar epithelium. Each ciliated cell has many cilia and microvilli. The nasopharynx is lined by respiratory epithelium that is pseudostratified, columnar, and ciliated. The epithelia cells are ciliated, cylindrical, and polarized with three distinct regions. Club cells are found in the ciliated simple epithelium. Simple columnar epithelium is further divided into two categories&colon; ciliated and non-ciliated (glandular). Nasal hair is different from the cilia of the ciliated lining of the nasal cavity. Terminal bronchioles contain a limited number of ciliated cells and no goblet cells. They divide and differentiate to form both ciliated and non-ciliated epithelial cells. The ductuli are unilaminar and composed of columnar ciliated and non-ciliated (absorptive) cells. It is lined by a ciliated mucous membrane.