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Articular disc: A flat structure composed of fibrocartilaginous tissue and positioned between the articular surfaces of the condylar process of the mandible and mandibular fossa of the temporal bone, separating the joint capsule into dorsal and ventral compartments.

Condylectomy (TMJC): Resection of the condylar process of the mandible.

Mandibular condyle: A convex prominence at the end of the condylar process of the mandible that articulates with the mandibular fossa.

Mandibular fossa: A concave depression in the temporal bone that articulates with the mandibular condyle.

Open‐mouth jaw locking (OMJL): Inability to close the mouth due to locking of the coronoid process of the mandible ventrolateral to the ipsilateral zygomatic arch.

Partial coronoidectomy (CORP): Partial removal of the coronoid process of the mandible.

Partial zygomectomy (ZYGP): Partial removal of the zygomatic arch.

Retroarticular process: A projection of the temporal bone that protrudes ventrally from the caudal end of the zygomatic arch and carries part of the mandibular fossa.

Temporomandibular joint: The area where the condylar process of the mandible articulates with the mandibular fossa of the temporal bone.

Temporomandibular joint ankylosis (TMJA): Fusion between the bones forming the temporomandibular joint or those in close proximity, resulting in progressive inability to open the mouth; removal of bone in ankylotic areas is abbreviated as TMJAR.

Temporomandibular joint dysplasia (TMJD): Dysplasia of soft or hard tissues forming the temporomandibular joint.

Temporomandibular joint fracture (TMJFX): Fracture of one or more bony structures forming the temporomandibular joint.

Temporomandibular joint luxation (TMJLUX): Displacement of the condylar process of the mandible; manual or surgical reduction of temporomandibular joint luxation is abbreviated as TMJLUXR.