Diencephalic influences on the jaw opening reflex in the cat

Achari, N.K.; Thexton, A.J.

doi:10.1016/0003-9969(72)90182-3

Cited by 14 publications

(1 citation statement)

References 11 publications

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“…Achari & Thexton, (1972) have demonstrated in the cat that electrical stimulation of a certain area of the limbic system abolishes the jaw opening reflex elicited by electrical stimulation of the infraorbital nerve. This finding is supporting evidence for the inhibitory effect of limbic structures on the afferent input.…”

Section: Discussionmentioning

confidence: 99%

Excitatory response of jaw elevators associated with sudden discomfort during chewing

Stohler

Ash

1986

J of Oral Rehabilitation

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Abnormalities associated with the chewing contraction of the masseteric and anterior temporal muscles were evaluated in patients who sensed pain in the area of the temporomandibular joint during mandibular movement. The patients were instructed in the use of an electronic switch to mark any event of discomfort/pain during natural chewing. Individual stimulus to response reaction-times were determined. The electromyographic pattern of the jaw elevators was quantified by root mean square (r.m.s.) peak voltage and contraction time. The statistical analysis of group data showed significantly prolonged contraction times and greater r.m.s. amplitudes for chewing cycles with, compared to cycles without, indication of pain. Also, individual data showed statistically significant differences between painful and non-painful cycles in some cases. It is concluded, that the conscious perception of nociception during the closing phase of chewing is associated with an excitatory response of jaw elevators.

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Section: Discussionmentioning

confidence: 99%

Excitatory response of jaw elevators associated with sudden discomfort during chewing

Stohler

Ash

1986

J of Oral Rehabilitation

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Neural Mechanisms of Mandibular Control: Mastication and Voluntary Biting

Luschei

Goldberg

1981

Comprehensive Physiology

130

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The effect of electrical stimulation in the hypothalamus on the monosynaptic jaw closing and the disynaptic jaw opening reflexes in the cat

Landgren

Olsson

1980

Exp Brain Res

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The effects of electrical stimulation in the hypothalamus on the monosynaptic jaw closing and the disynaptic jaw opening reflexes were investigated in cats anaesthetized with chloralose. The hypothalamic electrodes were located by observation of behavioural attack responses in the unanaesthetized animal and by means of Horsley-Clarke coordinates. The locations were verified in histological serial sections. Hypothalamic conditioning with trains of 3--10 pulses, 0.5 ms duration, 0.5 mA, 500 Hz, evoked a strong facilitation of the jaw closing reflex and a facilitation followed by an inhibition of the jaw opening reflex. These effects differed from those elicited from the cerebral cortex. The hypothalamic effects had a longer latency (11--13 ms) and required a longer train of conditioning stimuli than was the case with those evoked from the cortex. Bilateral ablation of the sensorimotor cerebral cortex or lesion of the pyramids at the lower pontine level diminished but did not abolish the hypothalamic effects. They did, however, disappear after lesions including the ventral midbrain tegmentum. The stimulus positions eliciting the largest hypothalamic effects on the jaw reflexes were located in a region extending medio-laterally from the perifornical area to the entrance of the ansa lenticularis in the lateral hypothalamus. Rostro-caudally the location was found at the level of the ventromedial hypothalamic nucleus and the anterior hypothalamus just rostral to this nucleus. The region corresponds to those parts of the hypothalamus from which agonistic and feeding responses have been evoked. It is suggested that the observed hypothalamotrigeminal mechanism may exercise a tonic influence on the trigeminal motoneurones, thereby controlling the set point of the biting force. The implications of this hypothesis on the etiology of bruxism and the myofascial pain dysfunction are discussed.

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Diencephalic influences on the jaw opening reflex in the cat

Cited by 14 publications

References 11 publications

Excitatory response of jaw elevators associated with sudden discomfort during chewing

Excitatory response of jaw elevators associated with sudden discomfort during chewing

Neural Mechanisms of Mandibular Control: Mastication and Voluntary Biting

The effect of electrical stimulation in the hypothalamus on the monosynaptic jaw closing and the disynaptic jaw opening reflexes in the cat

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