Cloisson sagittale are small, bilateral,sagittally oriented slips of fascia extending from the buccopharyngeal fascia anteriorly to the prevertebral fascia posteriroly close to their attachment to the transverse process of cervical vertebrae. These slips separate the retropharyngeal space which is present medially from the laterally placed retrostyloid compartment of the parapharyngeal space. These slips are also known as alar fascia.
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