Question

Which of the following regions is/are lined by pseudostratified columnar ciliated glandular epithelium?

• A. Olfactory region of the nasal chamber
• B. Trachea
• C. Respiratory region of the nasal chamber
• D. All the above

Answer 1

The correct option is D All the above

The nasal chamber is differentiated into three regions- vestibular, respiratory, and olfactory. The vestibular region is lined by skin, hair, and sebaceous glands which prevent the entry of large dust particles. The respiratory region is lined by pseudostratified columnar ciliated glandular epithelium which filters and conditions the air. The olfactory region is present next to it which is lined by the olfactory epithelium/Schneiderian membrane which senses the smell. It is lined by a thin layer of a pseudo-stratified ciliated epithelium and have a highly vascularized connective tissue.

The trachea has 4 layers- mucosa, submucosa, musculocartilaginous layer, and tunica adventitia that are arranged from inwards to outwards respectively. In the mucosa, the innermost layer is the epithelium which is pseudostratified columnar ciliated glandular epithelium . So both the trachea and the respiratory region are lined by pseudostratified columnar ciliated glandular epithelium.