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Question

Which type of tissues are present in nasal passages?


Solution

The nasal cavity is divided into two segments: the respiratory segment and the olfactory segment.

  • The respiratory segment comprises most of each nasal fossa and is lined with ciliated pseudostratified columnar epithelium (also called respiratory epithelium). The conchae, or turbinates, are located in this region. The turbinates have a very vascularized lamina propria (erectile tissue) allowing the venous plexuses of their mucosa to engorge with blood, restricting airflow and causing air to be directed to the other side of the nose, which acts in concert by shunting blood out of its turbinates. This cycle occurs approximately every two and a half hours.
  • The olfactory segment is lined with a specialized type of pseudostratified columnar epithelium, known as olfactory epithelium , which contains receptors for the sense of the smell. This segment is located in and beneath the mucosa of the roof of each nasal cavity and the medial side of each middle turbinate. Histological sections appear yellowish-brown due to the presence of lipofuscin pigments. Olfactory mucosal cell types include bipolar neurons, supporting (sustentacular) cells, basal cells, and Bowman 's  gland . The axons of the bipolar neurons form the olfactory nerve (cranial nerve I) which enters the brain through the cribiform plate.  Bowman's glands are serous glands in the lamina propria, whose secretions trap and dissolve odoriferous substances.
So epithelium tissues are present in nasal passage or nasal cavity. 

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