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  Functional anatomy of the equine temporomandibular joint: Histological characteristics of the articular surfaces and underlining tissues

Adams, K., Schulz-Kornas, E., Arzi, B., Failing, K., Vogelsberg, J., & Staszyk, C. (2018). Functional anatomy of the equine temporomandibular joint: Histological characteristics of the articular surfaces and underlining tissues. The Veterinary Journal, 239, 35-41. doi:10.1016/j.tvjl.2018.08.003.

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 Creators:
Adams, K., Author
Schulz-Kornas, Ellen1, Author                 
Arzi, B., Author
Failing, K., Author
Vogelsberg, J., Author
Staszyk, C., Author
Affiliations:
1Max Planck Weizmann Center for integrative Archaeology and Anthropology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society, ou_1497686              

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Free keywords: Biomechanical properties, Equine, Histology, Mastication, Temporomandibular joint
 Abstract: It has been assumed that dental conditions cause disorders of the equine temporomandibular joint (TMJ), due to biomechanical overload or aberrant loading. However, the incidence of published TMJ disorders in horses is low and this leads to the question whether the equine TMJ is adapted well to its biomechanical requirements or is able to remodel its articular surfaces in response to modified loading conditions. The aim of this study was to determine the histological characteristics of healthy equine TMJs. The tissue components of the articular surfaces of 10 TMJs obtained from horses without any clinical history of dental or TMJ disorders were analysed. Apart from the mandibular fossa of the temporal bone, the osseous aspects of the TMJ exhibited a uniform zoning pattern. The articular surfaces were composed of three tissue layers: (1) a superficial cell-rich dense connective tissue layer; (2) a middle fibrocartilage layer; and (3) a deep hyaline-like cartilage layer. The articular disc was composed of an inner core of fibrocartilage and hyaline-like cartilage meshwork covered with both cell-rich dense connective tissue and fibrocartilage at its dorsal and ventral aspects. In contrast, the mandibular fossa was only covered by a dense connective tissue, frequently supplemented by a synovial membrane, suggesting low biomechanical stress. Glycosaminoglycans, which are indicative of compressive loads, were predominantly present within the rostral part of the articular tubercle and the retroarticular process, the dorsal part of articular disc and the entire mandibular head, but were absent within the mandibular fossa. The results of this study suggest the presence of different biomechanical demands in the dorsal and ventral compartment of the equine TMJ.

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Language(s): eng - English
 Dates: 2018-09
 Publication Status: Issued
 Pages: 7
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.tvjl.2018.08.003
 Degree: -

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Title: The Veterinary Journal
  Alternative Title : The Veterinary Journal
Source Genre: Journal
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Publ. Info: New York : Elsevier
Pages: - Volume / Issue: 239 Sequence Number: - Start / End Page: 35 - 41 Identifier: ISSN: 1090-0233