[Magnetic stimulation of the scalp: the responses of the masseter muscles. II].
Magnetic stimulation of nervous elements is a new technique of investigation in intact alert man. Electromyographic responses of the masseter muscles were recorded in normal volunteers and in two patients with hemispheric or capsular lesions, both by surface and needle electrodes. In the patients "cortical" responses were absent when stimulating the affected hemisphere and present when stimulating the unaffected one. These findings suggest that the direct facilitating cortico-nuclear projections for the masseter muscle are mainly crossed. Nevertheless the presence of clear ipsilateral responses after stimulation of the unaffected hemisphere demonstrates the existence of uncrossed projections; in fact only the ipsilateral motor cortex can be the site of origin of the responses in these patients.
Macaluso
G M
GM
Università degli Studi di Parma, Istituto di Clinica Odontoiatrica.
Pavesi
G
G
Bonanini
M
M
Mancia
D
D
Gennari
P U
PU
D000328:Adult; D001037:Aphasia / Q000503:physiopathology / Q000628:therapy; D002545:Brain Ischemia / Q000503:physiopathology / Q000628:therapy; D004576:Electromyography; D004594:Electrophysiology; D005260:Female; D006429:Hemiplegia / Q000503:physiopathology / Q000628:therapy; D006801:Humans; D008280:Magnetics / Q000295:instrumentation; D008297:Male; D008406:Masseter Muscle / Q000502:physiology*; D008410:Masticatory Muscles / Q000502:physiology*; D008875:Middle Aged; D009431:Neural Conduction / Q000502:physiology; D012535:Scalp; D014276:Trigeminal Nerve / Q000502:physiology
Stimolazione magnetica allo scalpo: risposte nei masseteri. Parte II.