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Describe the surgical anatomy of Nasopharynx (the postnasal space).

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The nasopharynx is a large space with rapid walls approximately

∼4 cm high

∼4 cm wide

∼3 cm in Antero-Posterior dimension

∼2 cm deep.

The anterior wall: chaonal orifice and posterior margin of the nasal septum

The floor: upper surface of soft palate anterior 2/3 and the nasopharyngeal isthmus

The roof and posterior wall form a continuous stopping surface bounded by

  • the body of the sphenoid – the basiocciput
  • the first a cervical vertebrate to the level of soft palate.
  • The upper portion of the posterior wall lies in front of the anterior arch of the atlas with a mass of lymphoid (adenoid). The prevertebral fascia and muscles separate the arytenoid from the vertebrae.
  • The posterior wall is ∼8 cm from the pyriform aperture along the nasal floor.
  • The lateral wall: Pharyngeal orifice of ET and it is located in the middle of the wall ∼1.5 cm equidistant from the roof posterior wall, choana and the floor .
  • Postero-superior lips: torus tubals or tubal elevation the posterior margin of torus→Fossa of Rosenmuller.
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