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Response properties of trigeminal ganglion mechanosensitive neurons innervating the temporomandibular joint of the rabbit

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Abstract

The primary mechanosensitive neurons innervating the temporomandibular joint (TMJ neurons) may play an important role in controlling mandibular movement and position. The purpose of the study was to investigate the neurophysiological properties of TMJ neurons during passive movement of the isolated condyle in 55 rabbits and the intact condyle in 29 rabbits. Discharges of TMJ neurons from the trigeminal ganglion were recorded with a microelectrode as the isolated condyle was moved manually and by a computer-regulated mechanostimulator and as the intact condyle was manually stimulated. A total of 237 TMJ neurons were recorded rostrocaudally from the mandibular nerve area lateral to the maxillary region in the dorsal half of the trigeminal ganglion. Of the recorded TMJ units, 97% were slowly adapting (SA) and 67% of the SA units had an accompanying ongoing discharge. The proportion of adaptation types and appearance of ongoing discharges for the isolated condyle did not differ significantly from those for the intact condyle. Most of the TMJ units (89%) responded multidirectionally to the rostral and ventral movements of the isolated condyle. The discharge frequencies of the TMJ units increased as the condylar displacement and velocity increased within a 5-mm anterior displacement of the isolated condyle. Displacement of the isolated condyle influenced the discharge frequency of the units to a greater extent than the velocity of the condyle movement. No responses of TMJ units were observed during the descending ramp. Based on these results, we conclude that sensory information is transmitted by TMJ neurons encoding joint position, displacement and velocity in a physiological range of mandibular displacement.

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Authors and Affiliations

  1. Division of Aging and Geriatric Dentistry, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai, 980-8575, Japan

    Akito Tsuboi, Yasuo Takafuji, Shintaro Itoh, Kazuki Nagata, Takayoshi Tabata & Makoto Watanabe

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  1. Akito Tsuboi
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  2. Yasuo Takafuji
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  3. Shintaro Itoh
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  4. Kazuki Nagata
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  5. Takayoshi Tabata
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  6. Makoto Watanabe
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Correspondence to Akito Tsuboi.

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Tsuboi, A., Takafuji, Y., Itoh, S. et al. Response properties of trigeminal ganglion mechanosensitive neurons innervating the temporomandibular joint of the rabbit. Exp Brain Res 199, 107–116 (2009). https://doi.org/10.1007/s00221-009-1978-z

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  • DOI: https://doi.org/10.1007/s00221-009-1978-z

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