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Pterygomandibular Ligament

raphe pterygomandibularis

The pterygomandibular ligament (raphe) is a fibrous band stretching from the hamulus of the medial pterygoid plate to the posterior end of the mylohyoid line on the mandible, forming the common origin for the buccinator anteriorly and the superior pharyngeal constrictor posteriorly.

Region: Head & Skull

Biomechanics

Function & Actions

Serves as the common tendinous origin for buccinator and superior pharyngeal constrictor, and forms the anterior boundary of the pterygomandibular space where the inferior alveolar nerve and vessels travel.

Clinical Relevance

Clinical Notes

The pterygomandibular raphe is the key landmark for inferior alveolar nerve block — the needle is directed just medial to the raphe, targeting the inferior alveolar nerve in the pterygomandibular space. In oral cancer surgery, raphe involvement indicates advanced tumour requiring composite resection.

Pathology

Common Injuries & Conditions

Inferior Alveolar Nerve Block Reference

The pterygomandibular raphe guides needle placement for IAN block — the syringe barrel rests on the contralateral premolars and the needle passes just medial to the raphe.

Pterygomandibular Space Abscess

Infection spreading into the pterygomandibular space bounded by the raphe, producing severe trismus and requiring surgical drainage through an intraoral incision along the raphe.