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Review
. 2018 Aug;16(4):360-368.
doi: 10.1007/s11914-018-0447-7.

Part I: Development and Physiology of the Temporomandibular Joint

David L Stocum  1 , W Eugene Roberts  2   3   4
Affiliations
Review

Part I: Development and Physiology of the Temporomandibular Joint

David L Stocum et al. Curr Osteoporos Rep. 2018 Aug.

Abstract

Purpose of review: Investigate the developmental physiology of the temporomandibular joint (TMJ), a unique articulation between the cranium and the mandible.

Recent findings: Principal regulatory factors for TMJ and disc development are Indian hedgehog (IHH) and bone morphogenetic protein (BMP-2). The mechanism is closely associated with ear morphogenesis. Secondary condylar cartilage emerges as a subperiosteal blastema on the medial surface of the posterior mandible. The condylar articular surface is immunoreactive for tenascin-C, so it is a modified fibrous periosteum with an underlying proliferative zone (cambrium layer) that differentiates into fibrocartilage. The latter cushions high loads and subsequently produces endochondral bone. The TMJ is a heavily loaded joint with three cushioning layers of fibrocartilage in the disc, as well as in subarticular zones in the fossa and mandibular condyle. The periosteal articular surface produces fibrocartilage to resist heavy loads, and has unique healing and adaptive properties for maintaining life support functions under adverse environmental conditions.

Keywords: BMP-2; Fibrocartilage; Healing blastema; Indian hedgehog; Morphogenesis; Periosteum; Pharyngeal arch; TMJ; Tenascin-C.

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