The pharyngobasilar fascia is a strong fibrous layer lying deep to the pharyngeal constrictor muscles. It attaches the upper pharynx to the base of the skull and fills the gap above the superior constrictor, where only this fascia and mucosa form the pharyngeal wall.
| Location | In the wall of the upper pharynx, between the mucosa and the constrictor muscles. |
|---|---|
| Boundaries |
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Anchors the pharynx to the skull base and completes the pharyngeal wall above the superior constrictor.
The fascia forms the wall of the nasopharynx in the area of the pharyngeal recess, a common site of nasopharyngeal carcinoma, which can spread through it into the parapharyngeal space. The auditory tube and levator veli palatini pass above the superior constrictor through the gap it closes.
A tumour arising near the pharyngeal recess may break through the pharyngobasilar fascia into the parapharyngeal space and skull base, causing ear blockage and cranial nerve palsies.
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