A study on inhibition of masseteric α-motor fibre discharges by mechanical stimulation of the temporomandibular joint in the cat

Abe, Kengo; Takata, Minoru; Kawamura, Yōjirō

doi:10.1016/0003-9969(73)90150-7

Cited by 25 publications

(9 citation statements)

References 2 publications

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“…These findittgs are in agreement with those of Abe, Takata & Kawamura (1973), who were able to record impulses from efferent fibres going to the masseter muscle when the mouth of the experimental animal was held open. According to MacDougall & Andrew (1953) and Carlsoo (1956), the tetnporal and masseter muscles in man also contract when the mouth is opened maximally.…”

Section: Discussionsupporting

confidence: 91%

Reflex control of the jaw muscles by stimuli from receptors in the periodontal membrane

Kloprogge

1975

J of Oral Rehabilitation

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In the opinion of a number of investigators, the only function of the mechano-receptors in the periodontal membrane is to inhibit closure of the jaws via a reflex pathway when a predetermined pressure on the teeth has been exceeded. In our opinion, the receptor system in the periodontal membrane may also play a role in a complex regulatory system which controls the movements of the lower jaw during chewing. In order to test this hypothesis a study was made of the changes occurring in the contraction pattern of three masticatory muscles of the cat, when the cuspids in the upper jaw were displaced in various directions. In all the experimental animals used, electromyographic changes in the three muscles investigated, could be recorded as a result of displacement of the cuspids. The results obtained suggest, at least in the case of the temporal and pterygoid muscles, that there are specific reflexogenic zones in the periodontal membrane, These results support the previously suggested hypothesis that a number of the pressure-sensitive receptors in the periodontal membrane play a role in a regulatory system which controls the movements of the lower jaw--as during chewing--by exerting a reflex influence on the degree of contraction of the masticatory muscles. In the discussion this hypothesis is worked out in more detail and the extent to which the results fit the chewing pattern of the cat is examined. In the conclusion, the author asks whether the finding of a regulatory system in the cat may also be applied to man.

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Section: Discussionsupporting

confidence: 91%

Reflex control of the jaw muscles by stimuli from receptors in the periodontal membrane

Kloprogge

1975

J of Oral Rehabilitation

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“…(4) Displacement of the condylar position may also have changed the feedback to the elevator muscles, as it was reported by Abe, Takata & Kawamura (1973) that the receptors in the TMJ are able to modify the stimulation threshold of the motoneurons of the masticatory muscles.…”

Section: Discussionmentioning

confidence: 99%

Influence of experimental interfering occlusal contacts on the activity of the anterior temporal and masseter muscles during submaximal and maximal bite in the intercuspal position

Sheikholeslam

Riise

1983

J of Oral Rehabilitation

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The effects of an intercuspal occlusal interference on the pattern of activity of the anterior temporal and masseter muscles during submaximal and maximal bite, were studied in eleven volunteers with complete, natural dentitions. The results show that, during maximal and submaximal bite an occlusal interference (about 0.5 mm) in the intercuspal position is able to disturb the almost symmetric pattern of muscular activity in the anterior temporal and masseter muscles. Further, the level of muscular activity during maximal bite decreased significantly in all muscles studied. In some subjects, the decrease of muscular activity could still be observed one week after insertion of the interfering contact. After eliminating the interference, the muscular co-ordination pattern improved and the level of muscular activity increased significantly.

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“…For analysing activities of jaw closer motoneurones, functionally isolated single fibres are often prepared from the cut central ends of the masseter nerve (Abe, Takata & Kawamura, 1973;Appenteng, Morimoto & Taylor, 1980). In such preparations, units are occasionally found which respond to muscle stretch with far more sensitivity than the ordinary alpha motor units, and behave like muscle spindle afferents.…”

Section: Introductionmentioning

confidence: 99%

Branching of muscle spindle afferents of jaw closing muscles in the cat.

Kato¹,

Kawamura²,

Morimoto³

1982

The Journal of Physiology

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SUMMARY1. Functionally isolated single fibres were prepared from the cut central ends of the masseter nerve in cats. Of those firing in response to muscle stretch, most were alpha motor units but some had the properties of afferent fibres innervating muscle receptors.2. These afferent units were remarkably sensitive to muscle stretch even under anaesthesia deep enough to eliminate all stretch evoked e.m.g. activity in masseter. Moreover, these units responded to gentle pressing of the surface of either the masseter, temporalis or pterygoid muscles.3. On the basis of their responses to ramp stretch, to high-frequency vibration, to suxamethonium, and to gentle pressing of the muscle surface, the majority were considered to arise from primary or secondary endings of muscle spindles.4. In reflexly induced jaw movements, the highest discharge frequency of these spindles was observed during the jaw opening phase. However, they were also activated during the jaw closing phase, indicating that the fusimotor innervation to the source spindle was still preserved.5. From these results, it is concluded that branching of the spindle afferent outside the capsule occurs in the muscle nerve innervating cat's jaw closing muscles.

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A study on inhibition of masseteric α-motor fibre discharges by mechanical stimulation of the temporomandibular joint in the cat

Cited by 25 publications

References 2 publications

Reflex control of the jaw muscles by stimuli from receptors in the periodontal membrane

Reflex control of the jaw muscles by stimuli from receptors in the periodontal membrane

Influence of experimental interfering occlusal contacts on the activity of the anterior temporal and masseter muscles during submaximal and maximal bite in the intercuspal position

Branching of muscle spindle afferents of jaw closing muscles in the cat.

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