QS Study

Nasopharynx is the upper part of the pharynx. It is located behind the nasal cavities and above the soft palate.

Situation: Behind the nose and above the lower border of the soft palate. It is the upper part of the throat behind the nose. It is 2 to 3 cm wide and 3 to 4 cm long and situated behind the nasal fossa inside the occipital bone.

Parts:

(A) Roof: Formed by –

  1. A body of sphenoid bone and
  2. Basilar part of occipital bone.

(B) Floor: Formed by –

  • The upper surface of the soft palate.
  • Pharyngeal isthmus, an opening in the floor between the free edges of the soft palate and posterior pharyngeal wall.

(C) Anterior wall: Formed by posterior nasal apertures. It’s created by posterior nasal apertures divided by the posterior edge of the nasal septum.

(D) Posterior wall: Supported by the anterior arch of the atlas. It creates a constant sloping surface with the roof. It’s supported by an anterior arch of C1 vertebra.

(E) Lateral wall: It has –

  1. the opening of the auditory tube.
  2. The tubal elevation bounds the tubal opening,
  3. The salpingopharyngeal fold.
  4. The levator palati.
  5. The pharyngeal recess.

nasopharynx 1

Fig: Nasopharynx parts

Communications:

Anteriorly: With the nasal cavities through posterior nasal apertures.

Inferiorly: With the oropharynx at the pharyngeal isthmus.

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