Cortical control for mastication in cats: Changes in masticatory movements following lesions in the masticatory cortex

Hiraba, Hisao; Sato, Takako

doi:10.1080/08990220500084636

Cited by 11 publications

(8 citation statements)

References 33 publications

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“…Detailed descriptions of most of the methods have already been published (Hiraba et al 1997(Hiraba et al , 2000Hiraba 2004;Hiraba and Sato 2004, 2005b, 2005c and so the following descriptions focus on new methodological approaches.…”

Section: Methodsmentioning

confidence: 99%

Organization of cortical processing for facial movements during licking in cats

Hiraba¹,

Sato

Saito³

et al. 2007

Somatosensory & Motor Research

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We proposed that cortical organization for the execution of adequate licking in cats was processed under the control of two kinds of affiliated groups for face and jaw & tongue movements (Hiraba H, Sato T. 2005A. Cerebral control of face, jaw, and tongue movements in awake cats: Changes in regional cerebral blood flow during lateral feeding Somatosens Mot Res 22:307-317). We assumed the cortical organization for face movements from changes in MRN (mastication-related neuron) activities recorded at area M (motor cortex) and orofacial behaviors after the lesion in the facial SI (facial region in the primary somatosensory cortex). Although we showed the relationship between facial SI (area 3b) and area M (area 4delta), the property of area C (area 3a) was not fully described. The aim of this present study is to investigate the functional role of area C (the anterior part of the coronal sulcus) that transfers somatosensory information in facial SI to area M, as shown in a previous paper (Hiraba H. 2004. The function of sensory information from the first somatosensory cortex for facial movements during ingestion in cats Somatosens Mot Res 21:87-97). We examined the properties of MRNs in area C and changes in orofacial behaviors after the area C or area M lesion. MRNs in area C had in common RFs in the lingual, perioral, and mandibular parts, and activity patterns of MRNs showed both post- and pre-movement types. Furthermore, cats with the area C lesion showed similar disorders to cats with the area M lesion, such as the dropping of food from the contralateral mouth, prolongation of the period of ingestion and mastication, and so on. From these results, we believe firmly the organization of unilateral cortical processing in facial SI, area C, and area M for face movements during licking.

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Section: Methodsmentioning

confidence: 99%

Organization of cortical processing for facial movements during licking in cats

Hiraba¹,

Sato

Saito³

et al. 2007

Somatosensory & Motor Research

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“…Motor Cx: the motor cortex. Summary of collected data from orofacial SI in Hiraba et al (2000), MA in Hiraba and Sato (2005). food, prolongation of the masticatory and food intake period recovered, but abnormal wide jaw-opening and tongue protrusion did not. On the other hand, rhythms of mastication and swallowing remained normal in the same way as cats with the lesions into orofacial SI (orofacial region of the first somatosensory cortex) and MA, as shown in our previous studies (Hiraba et al 1999(Hiraba et al , 2000.…”

Section: Mastication After Area P Lesionmentioning

confidence: 94%

“…We indicated these deficits in the early phase in Table II. Table II summarized deficits of various cats with orofacial SI lesion (Hiraba et al 2000), MA lesion (Hiraba and Sato 2005) and area P. Namely, the decrease of food intake rate, delay of masticatory start, dropping of 1 Decreased food intake rate þ À À þ þ 2 Delay of masticatory start þ À À þ þ 3 Dropping of food þ À À þ þ 4 Contralateral whisker hairs no-erection þ À À À À 5 Prolongation of masticatory and food intake period À þ þ þ þ 6 Abnormal tongue protrusion À À þ þ þ 7 Abnormal tongue protrusion À À À À þ 8 Rhythms of mastication and swallow À À À À À Plus (+) and minus (À) indicate appeared deficits and no changes in masticatory behaviors, respectively. Orofacial SI: the orofacial region of the primary somatosensory cortex.…”

Section: Mastication After Area P Lesionmentioning

confidence: 99%

“…The start of mastication fluctuated for about 20 days after the area P lesion as shown in Figure 3B and this instability recovered almost completely after that. Perhaps the altered intraoral sensory information arising from the abnormal tongue movements may disrupt the appropriate initiation of the masticatory process as well as deficits that occurred in cats with both intraoral MA lesions (Hiraba et al 1999;Hiraba and Sato 2005). Since the fluctuated masticatory start evoked by the bilateral MA lesion (Hiraba et al 1999;Hiraba and Sato 2005) is also produced by the unilateral area P lesion, this finding is supported by the cortico-cortical connection shown by the anatomical data in our previous paper (Hiraba and Sato 2004) that the unilateral area P will receive outputs from the integrated bilateral MA ( Figure 5).…”

Section: Mastication After Area P Lesionmentioning

confidence: 99%

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Cortical control of mastication in cats. 2. Deficits of masticatory movements following a lesion in the motor cortex

Hiraba

Sato²

2005

Somatosensory & Motor Research

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Our previous study suggested that area P in the lateral wall of the presylvian sulcus and MA (masticatory cortex) in the rostral part of the orbital gyrus play an important role in execution of mastication. The aim of this present study is to examine if changes in orofacial behaviors and masticatory movements occur in cats with lesions of area P. First, we explored the locations in area P through the use of single unit recording and ICMS (intracortical microstimulation). Since mastication related neurons (MRNs) with the mechanical receptive field (RF) in facial or intraoral region were intermingled in area P, we performed either a partial or entire lesion in area P by injections of 2 microl or 4 microl of 0.1% kainic acid. Cats with the entire lesion in area P showed a decrease of food intake rates associated with abnormal tongue protrusion and wide jaw-opening, fluctuation of masticatory start, and prolongation of masticatory and food intake periods. Abnormal movements of tongue and jaw did not recover, although their prolongation and fluctuation returned to normal levels in one month. On the other hand, all deficits evoked by cats with the partial lesion recovered in about one month. In cats with the partial and entire lesions, masticatory rhythm remained normal. These findings suggest that area P may regulate accurate and suitable tongue and jaw movements during mastication depending on cortical processing.

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“…Studies performed with rabbits have shown that after bilateral cortical masticatory area (CMA) ablation, the animal cannot manipulate food placed in the front of the mouth for several days, with a following partial recovery [20] , while repetitive stimulation of the CMA (which has projections to the ventral region of the putamen) elicits rhythmic jaw movements [21,22] . While cats with unilateral lesion of the CMA showed no changes in mastication except for prolongation of the food intake and masticatory periods, cats with bilateral CMA lesions showed wide jaw opening during mastication, delay in the 278 start of mastication, abnormal tongue protrusion and difficulty in manipulating food on the tongue [23,24] . Kempainen et al [25] performed a study in patients with unilateral cortical infarction in the region of the middle cerebral artery and showed no impairment of masticatory force and function.…”

Section: Discussionmentioning

confidence: 99%