Proprioceptive Representation of the Levator Veli Palatini Muscle in the Solitary Nucleus of the Rat

Furusawa, Kiyofumi; Yasuda, Kouichi; Okuda, Daizo; Yamaoka, Minoru

doi:10.1597/1545-1569_1996_033_0213_protlv_2.3.co_2

Cited by 4 publications

(1 citation statement)

References 14 publications

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“…There are only a few reports indicating that tongue muscles are innervated by muscle spindles (Kubota et al ., 1975; Purwar, 1979; Smith, 1989; Saigusa et al ., 2004). In contrast, several studies have demonstrated that lingual muscles and extrinsic tongue muscles lack typical muscle spindles in man and young adult Wistar rats (Bowman, 1968; Bout & Dubbeldam, 1991; Sherif et al ., 1991; Furusawa et al ., 1996). Electrophysiological studies have shown that the trigeminal sensory afferents influence and integrate tongue movement (Morimoto et al ., 1978; Lowe, 1984; Tolu et al ., 1993; Tolu et al ., 1994; Ishiwata et al ., 1997; Ishiwata et al ., 2000).…”

Section: Introductionmentioning

confidence: 99%

Neuronal circuitry and synaptic organization of trigeminal proprioceptive afferents mediating tongue movement and jaw–tongue coordination via hypoglossal premotor neurons

Luo

Zhang

Yang

et al. 2006

Eur J of Neuroscience

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The neural framework and synaptic organization of trigeminal proprioceptive afferent-mediated jaw-tongue coordination were studied in rats using multiple electrophysiological and neuroanatomical approaches. Electrostimulation of the masseter nerve evoked short-latency responses (5.86 +/- 2.59 ms) in hypoglossal premotor pools including the parvocellular (PCRt) and intermediate (IRt) reticular nuclei and the dorsomedial part of the spinal trigeminal nucleus oralis (Vodm) and interpolaris (Vidm). Biocytin-labelled axon terminals from these areas traveled into the hypoglossal nucleus (XII) and contacted motoneurons. Double labelling of biotinylated dextran amine (BDA) tracing and cholera toxin B (CTB) transport demonstrated that labelled axons and terminals from the mesencephalic trigeminal nucleus (Vme) overlapped with XII premotor neurons in the alpha division and in PCRt, IRt, Vodm and Vidm. Confocal microscopic observations revealed that Vme terminals closely contacted XII premotor neurons. Dual labelling of intracellular neurobiotin staining of jaw-muscle spindle afferents (JMSAs) combined with horseradish peroxidase (HRP) retrograde transport revealed that 498 JMSA boutons apposed to 146 HRP-labelled premotor neurons. Electron microscopic observations demonstrated that 127 JMSA boutons made both axodendritic (68%) and axosomatic (32%) synapses with XII premotor neurons. Eighty-three per cent of synapses were asymmetric and the rest (17%) were symmetric. Thirty-nine per cent of JMSA boutons received presynaptic contacts from P-type terminals. Varieties of synaptic organizations were found. These results provide evidence that trigeminal proprioceptive afferents mediate jaw-tongue coordination through XII premotor neurons. Ultrastructural findings demonstrated that synapses between JMSA boutons and XII premotor neurons are predominantly excitatory, and synaptic transmission to XII motoneurons is modified on XII premotor neurons by presynaptic mechanisms. These frameworks and synaptic organizations are most probably the neural substrate for trigeminal proprioceptive afferent-mediated jaw-tongue coordination.

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Section: Introductionmentioning

confidence: 99%

Neuronal circuitry and synaptic organization of trigeminal proprioceptive afferents mediating tongue movement and jaw–tongue coordination via hypoglossal premotor neurons

Luo

Zhang

Yang

et al. 2006

Eur J of Neuroscience

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The pharyngeal recess/Eustachian tube complex forms an acoustic passageway

Boedts

2018

Medical Hypotheses

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Main trajectories of nerves that traverse and surround the tympanic cavity in the rat

et al. 2000

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To guide surgery of nerves that traverse and surround the tympanic cavity in the rat, anatomical illustrations are required that are topographically correct. In this study, maps of this area are presented, extending from the superior cervical ganglion to the otic ganglion. They were derived from observations that were made during dissections using a ventral approach. Major blood vessels, bones, transected muscles of the tongue and neck and supra and infrahyoid muscles serve as landmarks in the illustrations. The course of the mandibular, facial, glossopharyngeal, vagus, accessory and hypoglossal nerves with their branches, and components of the sympathetic system, are shown and discussed with reference to data available in the literature. Discrepancies in this literature can be clarified and new data are presented on the trajectories of several nerves. The course of the tympanic nerve was established. This nerve originates from the glossopharyngeal nerve, enters the tympanic cavity, crosses the promontory, passes the tensor tympani muscle dorsally, and continues its route intracranially to the otic ganglion as the lesser petrosal nerve after intersecting with the greater petrosal nerve. Auricular branches of the glossopharyngeal and of the vagus nerve were noted. We also observed a pterygopalatine branch of the internal carotid nerve, that penetrates the tympanic cavity and courses across the promontory.

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Proprioceptive Representation of the Levator Veli Palatini Muscle in the Solitary Nucleus of the Rat

Cited by 4 publications

References 14 publications

Neuronal circuitry and synaptic organization of trigeminal proprioceptive afferents mediating tongue movement and jaw–tongue coordination via hypoglossal premotor neurons

Neuronal circuitry and synaptic organization of trigeminal proprioceptive afferents mediating tongue movement and jaw–tongue coordination via hypoglossal premotor neurons

The pharyngeal recess/Eustachian tube complex forms an acoustic passageway

Main trajectories of nerves that traverse and surround the tympanic cavity in the rat

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