Articular Surface Of The Mandibular Fossa On The Temporal Bone, Lateral View

Description

Mandibular fossa (glenoid fossa) of the temporal bone occupies the inferior aspect of the squamous temporal region, positioned just anterior to the external acoustic meatus and inferior to the root of the zygomatic process. In this lateral perspective, the articular surface appears as a concave depression that transitions anteriorly onto the articular tubercle (articular eminence), the convex ridge forming the anterior boundary of the temporomandibular joint (TMJ). Posteriorly, the fossa terminates near the postglenoid process, with the petrotympanic (squamotympanic) fissure marking the junction toward the tympanic part of the temporal bone. Surface relief is easy to orient. TMJ mechanics depend on the contour of the mandibular fossa and articular eminence because the mandibular condyle seats in the depression and translates onto the eminence during mouth opening, so flattening, osteophytes, or erosive change here correlate with osteoarthritis, pain with function, and altered condylar position. Dislocation commonly carries the condyle anterior to the articular eminence, and this fixed lateral view helps learners appreciate why a steep eminence can resist reduction and why excessive translation predisposes to locking with internal derangement. Proximity to the external acoustic meatus and petrotympanic fissure also supports teaching of referred otalgia and the relationship between TMJ pathology and ear symptoms, a point that often confuses trainees when otoscopy is normal. Dental anatomy courses and head and neck osteology labs can use this illustration to anchor TMJ surface landmarks before introducing the articular disc and capsule. It also suits oral and maxillofacial surgery texts describing preauricular approaches, condylar fracture assessment, and correlation with CT bone windows of the temporal component of the joint. Anatomical accuracy verified by SciePro's Medical Advisory Board.