The nasopharynx

  • The nasopharynx:
    • Is the upper one-third of the pharynx:
      • Is separated from the oropharynx below:
        • By the soft palate
    • Anatomically:
      • It is the space situated behind the nasal cavities:
        • Its mucosal lining starts:
          • Immediately behind the posterior choana
      • It is actually located in the center of the head:
        • And is more than 10 cm from the skin surface of the head in all directions
      • The undersurface of the body of the sphenoid bone:
        • Forms the roof of the nasopharynx:
          • Which slants downwards:
            • To form the posterior wall:
              • In front of the arch of the atlas and upper part of the body of the axis vertebrum
      • The floor of the nasopharynx:
        • Is formed by the upper surface of the soft palate which separates the nasopharynx from the oropharynx below
      • The lateral wall of the nasopharynx:
        • Is formed by the:
          • Opening of the Eustachian tubes superiorly and
          • The upper part of the superior pharyngeal constrictor muscle inferiorly
        • The orifice of the Eustachian (auditory tympanic) tube:
          • Is delineated by an incomplete cartilaginous ring:
            • The deficient portion is in the inferolateral aspect
            • The medial portion of the cartilaginous ring:
              • Elevates the overlying mucosa:
                • To form the medial crusa (torus tubarius)
              • The slit-like space formed by this medial crusa and the posterior wall of the nasopharynx:
                • Is the fossa of Rosenmüller

#Arrangoiz #HeadandNeckSurgeon #CancerSurgeon #Teacher #SurgicalOncologist

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