Nasopharynx

Definition

The nasopharynx is the upper part of the pharynx, located behind the nasal cavity and above the soft palate. It serves as a passageway for air from the nose to the throat and plays a role in respiratory functions.

5 Must Know Facts For Your Next Test

1. The nasopharynx contains lymphoid tissue, including the pharyngeal tonsils (adenoids), which are involved in immune responses.
2. It is lined with ciliated epithelial cells that help trap and move particles out of the respiratory tract.
3. Common infections of the nasopharynx include viral agents like rhinoviruses and bacterial pathogens such as Streptococcus pneumoniae.
4. The Eustachian tubes open into the nasopharynx, helping to equalize pressure in the middle ear.
5. Normal microbiota of the nasopharynx includes non-pathogenic bacteria that can prevent colonization by harmful pathogens.

Review Questions

• What type of epithelial cells line the nasopharynx and what is their function?
• Name two common pathogens that can infect the nasopharynx.
• Explain the role of the Eustachian tubes in relation to the nasopharynx.

Related terms

Oropharynx:

The middle part of the pharynx located behind the oral cavity; involved in both respiratory and digestive pathways.

Laryngopharynx:

The lower part of the pharynx that extends from the hyoid bone to the esophagus; serves as a pathway for food and air.

Adenoids:

Lymphoid tissue located in the roof of the nasopharynx; part of immune system defense against inhaled pathogens.