Somatotopic Organization of Perioral Musculature Innervation within the Pig Facial Motor Nucleus

2005 ◽  
Vol 66 (1) ◽  
pp. 22-34 ◽  
Author(s):  
Christopher D. Marshall ◽  
Ron H. Hsu ◽  
Susan W. Herring
Keyword(s):  
Motor Nucleus ◽  
Somatotopic Organization ◽  
Facial Motor Nucleus

The organization and activity patterns of the anterior and posterior heads of the guinea pig digastric muscle

1987 ◽  
Vol 58 (3) ◽  
pp. 496-509 ◽  
Author(s):  
A. Lev-Tov ◽  
M. Tal
Keyword(s):  
Guinea Pig ◽  
Activity Patterns ◽  
Motor Nucleus ◽  
Digastric Muscle ◽  
Fiber Types ◽  
Jaw Movements ◽  
Cross Sectional ◽  
Trigeminal Motor Nucleus ◽  
Facial Motor Nucleus ◽  
Early Activity

The structure and activity patterns of the anterior and posterior heads of the guinea pig digastric muscle (DG) were studied in ketamine-anesthetized guinea pigs. Collagen staining of longitudinal and transverse sections of the muscle revealed that the guinea pig DG is comprised of a unicompartmental anterior head (ADG) and a multicompartmental posterior head (PDG). The two heads are separated by a thin tendinous inscription that, unlike the intermediate tendon of the DG in humans, is not attached to the hyoid bone. The motor nuclei of the guinea pig DG were reconstructed using retrograde labeling with horseradish peroxidase. The motoneurons of the ADG were clustered in a longitudinal column within the trigeminal motor nucleus. The motoneurons of the PDG were segregated into two clusters within the facial motor nucleus. The cross-sectional areas of the ADG and PDG motoneuron somata exhibited unimodal frequency distributions and the average soma area was larger for ADG than PDG motoneurons. Histochemical characterization of ADG and PDG revealed that the two muscle heads contained the three main histochemical types of muscle fibers identified in limb muscles. The frequency distribution of fiber types in ADG and PDG were not significantly different. Both muscle heads were predominantly fast with slow oxidative fibers accounting for only 1.1 and 0.3% of the fibers in narrow dorsal regions of ADG and PDG, respectively, and 13.6 and 12.9% in the more ventral regions of ADG and PDG, respectively. Simultaneous recordings of EMGs from the ADG and PDG were carried out during spontaneously occurring rhythmical jaw movements. These recordings revealed a high degree of synchrony between the activities of the two heads, although differences were observed in the onset and duration of the EMG bursts. Activity in the PDG preceded activity in the ADG in most of the rhythmical cycles and persisted longer. The differences in latencies of time-locked EMGs evoked in the ADG and PDG by four-pulse cortical stimulation were much smaller than those observed between the activity bursts of the two heads during rhythmical jaw movements. It is suggested that the early activity in the PDG is accounted for by shorter central conduction times in the pathways onto it and/or by higher recruitability of its motor units. The early activity in PDG may serve to optimize the location of ADG on its length-tension curve prior to and during the active state.

Effects of perinatal undernourishment on neuronal development of the facial motor nucleus in the rat

2001 ◽  
Vol 905 (1-2) ◽  
pp. 54-62 ◽  
Author(s):  
Esther Perez-Torrero ◽  
Carmen Torrero ◽  
Manuel Salas
Keyword(s):  
Neuronal Development ◽  
Motor Nucleus ◽  
Facial Motor Nucleus

Regulation of CD44 in the Regenerating Mouse Facial Motor Nucleus

1997 ◽  
Vol 9 (9) ◽  
pp. 1854-1863 ◽  
Author(s):  
Leonard L. Jones ◽  
Georg W. Kreutzberg ◽  
Gennadij Raivich
Keyword(s):  
Motor Nucleus ◽  
Facial Motor Nucleus

scholarly journals Sciatic nerve stimulation activates the retrotrapezoid nucleus in anesthetized rats

2016 ◽  
Vol 116 (5) ◽  
pp. 2081-2092 ◽  
Author(s):  
Roy Kanbar ◽  
Ruth L. Stornetta ◽  
Patrice G. Guyenet
Keyword(s):  
Sciatic Nerve ◽  
Nerve Stimulation ◽  
Motor Nucleus ◽  
Sprague Dawley ◽  
Neuron Firing ◽  
Afferent Stimulation ◽  
Retrotrapezoid Nucleus ◽  
Facial Motor Nucleus ◽  
Stimulation Experiments ◽  
Sciatic Nerve Stimulation

Retrotrapezoid nucleus (RTN) neurons sustain breathing automaticity. These neurons have chemoreceptor properties, but their firing is also regulated by multiple synaptic inputs of uncertain function. Here we test whether RTN neurons, like neighboring presympathetic neurons, are excited by somatic afferent stimulation. Experiments were performed in Inactin-anesthetized, bilaterally vagotomized, paralyzed, mechanically ventilated Sprague-Dawley rats. End-expiratory CO2 (eeCO2) was varied between 4% and 10% to modify rate and amplitude of phrenic nerve discharge (PND). RTN and presympathetic neurons were recorded extracellularly below the facial motor nucleus with established criteria. Sciatic nerve stimulation (SNstim, 1 ms, 0.5 Hz) slightly increased blood pressure (6.6 ± 1.6 mmHg) and heart rate and, at low eeCO2 (<5.5%), entrained PND. Ipsi- and contralateral SNstim produced the known biphasic activation of presympathetic neurons. SNstim evoked a similar but weaker biphasic response in up to 67% of RTN neurons and monophasic excitation in the rest. At low eeCO2, RTN neurons were silent and responded more weakly to SNstim than at high eeCO2. RTN neuron firing was respiratory modulated to various degrees. The phasic activation of RTN neurons elicited by SNstim was virtually unchanged at high eeCO2 when PND entrainment to the stimulus was disrupted. Thus RTN neuron response to SNstim did not result from entrainment to the central pattern generator. Overall, SNstim shifted the relationship between RTN firing and eeCO2 upward. In conclusion, somatic afferent stimulation increases RTN neuron firing probability without altering their response to CO2. This pathway may contribute to the hyperpnea triggered by nociception, exercise (muscle metabotropic reflex), or hyperthermia.

Differential Innervation of Tissues Located at Traditional Acupuncture Points in the Rat Forehead and Face

2018 ◽  
Vol 36 (6) ◽  
pp. 408-414 ◽  
Author(s):  
Jia Wang ◽  
Jingjing Cui ◽  
Chen She ◽  
Dongsheng Xu ◽  
Zhiyun Zhang ◽  
...  
Keyword(s):  
Nervous System ◽  
Sensory Neurons ◽  
Motor Neurons ◽  
Acupuncture Point ◽  
Acupuncture Points ◽  
Motor Nucleus ◽  
Neural Pathways ◽  
Trigeminal Motor Nucleus ◽  
Facial Motor Nucleus ◽  
Neural Tracing

Objectives To compare the neural pathways associated with the tissues located at different traditional acupuncture points in the rat forehead and face using the cholera toxin B subunit (CTB) neural tracing technique. Methods After injection of CTB into the tissues at GB14, ST2 and ST6 in the rat, the neural labelling associated with each acupuncture point was revealed by fluorescent immunohistochemistry of the nervous system, including the trigeminal ganglion (TRG), cervical dorsal root ganglia (DRG), spinal cord and brain. Results The CTB labelling included sensory neurons and their transganglionic axonal terminals, as well as motor neurons. The labelled sensory neurons associated with GB14, ST2 and ST6 were distributed in both the TRG and cervical DRG, and their centrally projected axons terminated in an orderly fashion at their corresponding targets in the spinal trigeminal nucleus and cervical spinal dorsal horn. In addition, labelled motor neurons were observed in the facial motor nucleus, trigeminal motor nucleus and cervical spinal ventral horn, in which facial motor neurons projected to the tissues located at all three acupuncture points. Trigeminal motor neurons innervated both ST2 and ST6, while spinal motor neurons only correlated with ST6. Conclusions These results indicate that the tissues located at each of these three traditional acupuncture points in the rat forehead and face has its own sensory and motor connection with the nervous system in a region-specific pattern through distinct neural pathways. Understanding the neuroanatomical characteristics of acupuncture points from the peripheral nervous system to the central nervous system should help inform acupuncture point selection according to the demands of the clinical situation.

The Facial Motor Nucleus of the Dog

1988 ◽  
Vol 132 (4) ◽  
pp. 276-279 ◽  
Author(s):  
A. Prats-Galino ◽  
C. Costa-Llobet ◽  
J. Arroyo-Guijarro ◽  
D. Ruano-Gil
Keyword(s):  
Motor Nucleus ◽  
Facial Motor Nucleus

The Facial Motor Nucleus of the Dog

1988 ◽  
Vol 132 (4) ◽  
pp. 280-283
Author(s):  
C. Costa-Llobet ◽  
A. Prats-Galino ◽  
J. Arroyo-Guijarro ◽  
D. Ruano-Gil
Keyword(s):  
Motor Nucleus ◽  
Facial Motor Nucleus
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