- The nasopharynx:
- Is the upper one-third of the pharynx:
- Is separated from the oropharynx below:
- By the soft palate
- Is separated from the oropharynx below:
- Anatomically:
- It is the space situated behind the nasal cavities:
- Its mucosal lining starts:
- Immediately behind the posterior choana
- Its mucosal lining starts:
- 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
- To form the posterior wall:
- Which slants downwards:
- Forms the roof of the nasopharynx:
- 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
- Elevates the overlying mucosa:
- Is delineated by an incomplete cartilaginous ring:
- Is formed by the:
- It is the space situated behind the nasal cavities:
- Is the upper one-third of the pharynx:
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