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Stylomandibular Ligament

ligamentum stylomandibulare

The stylomandibular ligament is a thickening of the deep cervical fascia between the styloid process and the mandibular angle, forming the posterior boundary of the parotid space and the anterior boundary of the retromandibular space. It limits excessive mandibular protrusion and separates the parotid gland from the submandibular gland. Eagle syndrome from styloid process elongation puts the stylomandibular ligament under tension, contributing to throat pain.

Region: Head & Skull

Anatomical Data

Origin, Insertion & Supply

Origin	Styloid process of the temporal bone
Insertion	Posterior border of the mandibular ramus and angle

Biomechanics

Function & Actions

Actions	Limits excessive mandibular protrusion; separates the parotid from the submandibular gland

Clinical Relevance

Clinical Notes

The stylomandibular ligament is the key landmark distinguishing the parotid space (lateral and anterior to the ligament) from the deep parotid and parapharyngeal space (medial to the ligament). Deep lobe parotid tumours that extend medially to the stylomandibular ligament into the parapharyngeal space produce the classic dumbbell parotid tumour requiring extended surgical resection.

Pathology

Common Injuries & Conditions

Eagle Syndrome Ligament Involvement

Stylomandibular ligament tension from elongated styloid process contributing to throat pain and restricted mandibular movement.