Parapharyngeal space

Dr Jeremy Jones et al.

The parapharyngeal space is one of the seven deep compartments of the head and neck. It consists largely of fatty areolar tissue and contains branches of the trigeminal nerve as well as deep vessels.

The parapharyngeal space is shaped like a pyramid, inverted with its base at the skull base, with its apex inferiorly pointing to the greater cornu of the hyoid bone 2.

Contents
Boundaries

The parapharyngeal space has complex fascial margins occupying the space between the muscles of mastication and the muscles of deglutition2:

Relations
CT/MRI

The parapharyngeal space is crucial to the understanding of the deeps spaces of the neck, as it has direct relations with all but one of the other six deep compartments of the head and neck (the exception being the danger space, which is separated from the parapharyngeal space by the retropharyngeal space). 

The parapharyngeal space appears as a small triangular space (on axial imaging) with density/signal consistent with fat.  

Knowledge about the displacement patterns of fat within the parapharyngeal space will aid in the localisation of lesions within adjacent spaces. A lesion arising in the: 

A lesion arising in the parapharyngeal space will displace the carotid space posteriorly and/or is completely surrounded by parapharyngeal space fat. Lesions include:


Head and neck anatomy
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Article Information

rID: 10464
System: Head & Neck
Section: Anatomy
Tag: refs
Synonyms or Alternate Spellings:

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    Figure 1: in light blue on annotated MRI
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    Case 1: parapharyngeal abscess
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    Case 2: parapharyngeal space schwannoma
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    Parapharyngeal space: annotated MRI
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