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

K. Adams, E. Schulz-Kornas, Boaz Arzi, K. Failing, J. Vogelsberg, C. Staszyk

Research output: Contribution to journalArticle

1 Citation (Scopus)

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.

Original languageEnglish (US)
Pages (from-to)35-41
Number of pages7
JournalVeterinary Journal
Volume239
DOIs
StatePublished - Sep 1 2018

Fingerprint

Temporomandibular Joint
joints (animal)
Horses
Anatomy
Joints
Fibrocartilage
horses
Temporomandibular Joint Disorders
connective tissues
Connective Tissue
Hyaline Cartilage
cartilage
Tooth
teeth
zoning
Synovial Membrane
Temporal Bone
glycosaminoglycans
Glycosaminoglycans
tissues

Keywords

  • Biomechanical properties
  • Equine
  • Histology
  • Mastication
  • Temporomandibular joint

ASJC Scopus subject areas

  • Animal Science and Zoology
  • veterinary(all)

Cite this

Functional anatomy of the equine temporomandibular joint : Histological characteristics of the articular surfaces and underlining tissues. / Adams, K.; Schulz-Kornas, E.; Arzi, Boaz; Failing, K.; Vogelsberg, J.; Staszyk, C.

In: Veterinary Journal, Vol. 239, 01.09.2018, p. 35-41.

Research output: Contribution to journalArticle

Adams, K. ; Schulz-Kornas, E. ; Arzi, Boaz ; Failing, K. ; Vogelsberg, J. ; Staszyk, C. / Functional anatomy of the equine temporomandibular joint : Histological characteristics of the articular surfaces and underlining tissues. In: Veterinary Journal. 2018 ; Vol. 239. pp. 35-41.
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