The stylomandibular ligament is formed due to thickening of the investing layer of deep cervical fascia, which separates the parotid and submandibular glands. This ligament also becomes taut when the mandible is protruded. The accessory ligaments of temporomandibular joints control range of motion (ROM) of TMJs and with mandible form a ‘swing’. The ligaments are the fibrous capsule, temporomandibular, sphenomandibular, and stylomandibular ligaments. The latter two are accessory ligaments.