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Results for “Masticatory Muscles”

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At least 19 recordsLinked to original sources
PubMed1979

Muscle spindle supply to the masticatory muscles in the Japane ermine (Carnivora).

Histological examination of the jaw muscles of the Japanese ermine showed that 4 jaw-closing muscles have 13 muscle spindles on one side of the face. The temporal muscle has 99 muscle spindles, 68 being in the anterior vertical and 31 in the posterior horizontal belly. The masseter muscle has 33 muscle spindles, 23 being in the profound and 10 in the superficial belly. The medial pterygoid muscle has 7 muscle spindles and the zygomaticomandibular muscle contains 4 muscle spindles. The lateral pterygoid and the jaw-opening muscles have no spindles.

Animals↗
PubMed1979

[Role of functional interaction between the facial and masticatory muscles in the genesis of synkineses in patients with neuritis of the facial nerve].

The electromyogram of orbicular muscles of the eye and masticatory muscles was studied in 19 patients with facial nerve neuritis and 11 normals. In a maximum contraction of the masticatory muscles, the orbicular muscles of the eye showed an activity equal to about 9% of the maximum amplitude of the orbicular muscles. Similar activity in the paretic muscles was not decreased. The development of secondary synkinesia is postulated.

Adolescent↗
PubMedDate not supplied

Proprioceptive innervation of the masticatory muscles in Pinché.

This study of the masticatory muscles of the primate showed that the temporal muscle contained 107 muscle spindles, 45 in the horizontal portion and 62 in the vertical portion; the masseter muscle contained 70, 58 in the profundus portion and 12 in the superficial portion; the medial pterygoid muscle contained 15; the lateral pterygoid muscle contained 6; and the zygomaticomandibular muscle contained 9. The muscle spindles were located around the coronoid process and mandibular ramus.

Animals↗
PubMed1979

Motor nuclear representation of masticatory muscles in the rat.

Representation of the masticatory muscles within the motor trigeminal nucleus was studied in rats by the horseradish peroxidase (HRP) method and the antidromic field potential method. The motor trigeminal nucleus of the rat could be divided cytoarchitecturally into a dorsolateral and a ventromedial division. Within the dorsolateral division, the temporal muscle was represented dorsomedially, the masseter muscle dorsolaterally and laterally, and the lateral and medial pterygoid muscles ventrolaterally. Within the ventromedial division, the anterior digastric muscle was represented dorsomedially and the mylohyoid muscle ventrolaterally. Distribution of antidromic field potentials evoked by stimulation of the mylohyoid and masseteric nerves coincided with the results from the HRP investigation.

Animals↗
PubMed1975

[Uptake and transport of exogenous peroxidase in the masticatory muscles of cats. Localization of ganglionic neurons].

Retrograde axonal transport of Horseradish peroxydase (HRP) has been used to trace the cells of origin of proprioceptive fibers in jaw-closing and jaw-opening muscles. After injection of HRP in young cats' masticatory muscles (masseteric, temporal, pterygoid, mylohyoid and digastric) labelled neurons were found in the ipsilateral semi-lunar ganglion and trigeminal mesencephalic nucleus. It is concluded that sensory endings are present in jaw-opening as in jaw-closing muscles; possibly the afferent fibers from muscle endings of the opener muscles have their somata in the mesencephalic nucleus, afferent fibers from tendinous receptors in the semi-lunar ganglion.

Animals↗
PubMed1978

Correlative study of pain perception and masticatory muscle reflexes in man.

An attempt was made to explore the possibility of using the masticatory muscle reflexes as pain indices in human subjects. It was found that the digastric reflex, so readily evoked by electrodental stimulation in experimental animals, could not be consistently elicited in man. The reflex silent period of the masseteric muscles, on the other hand, may be used as a pain index for evaluating dental analgesia, provided that analgesic interference is anticipated at points along the reflex arc.

Adult↗
PubMed1975

[Uptake and transport of exogenous peroxidase in the masticatory muscles of the cat. Localization of motor neurons].

In the present work, a topographical localization of masticatory muscle motoneurons was undertaken. Horseradish peroxydase injected in each muscle can be transported in the retrograde direction to the corresponding motoneurons cell bodies. Jaw-closing muscle motoneurons were identified in the dorsal part of the motor trigeminal nucleus whereas jaw-opening muscle motoneurons were observed in the ventro-medial region.

Animals↗
PubMed1979

Relation between integrated electromyographic activity and biting force during voluntary isometric contraction in human masticatory muscles.

The relation between integrated electromyographic activity and computed biting force during voluntary isometric contraction was evaluated in the masticatory muscles of healthy subjects. The slopes of the curves relating integrated electromyographic activity to computed biting force in masseter muscles were steeper on the non-preferred chewing side than on the preferred chewing side, and they progressively became steeper during the course of continuous isometric contraction of a given biting force.

Action Potentials↗
PubMed1977

[Electromyographic studies on the masticatory muscles after the preparation of terminal molars as denture abutments].

When the occlusal surfaces of terminal molars are ground off during bridge preparation, the occlusal support for the condyle of the affected side disappears and thus the intermaxillary distance declines. The effect of this process on the masticatory muscles was examined electromyographically in nine patients. It was found that the muscle activity especially in the m. temporalis is immediately reduced by 30 to 40%.

Adult↗
PubMed1979

[Headache due to functional disorders of the masticatory organ. Headache due to tension of the masticatory muscles].

Headache in the temporal, frontal and suboccipital regions are described as to case history, findings and differential diagnosis. With due respect to possible further symptoms of dysfunction, the author indicates as principles to treatment: 1. restoration of the continuity of the rows of teeth, and of the occlusal relations; 2. restoration of correct jaw relations; 3. rehabilitation of masticatory muscles.

Dental Occlusion, Centric↗