Objective: To describe the reflex responses evoked by trigeminal stimulation in perioral facial motor units (MUs) in humans. Methods: We recorded single motor units (MUs) from perioral muscles performing three movements: elevation of the upper lip (levator labii superioris muscle - LLS), protrusion of the lips (orbicularis oris muscle - OOr) and depression of the lower lip (depressor anguli oris and depressor labii inferioris muscles - DAO/DLI) with concentric needle electrodes. MUs were tested during constant voluntary activation with non-painful cutaneous electrical stimuli applied to the mental or supraorbital nerves and intraorally. Analysis was performed with peristimulus histograms and cumulative sum. Results: Eighty MUs were sampled from 17 subjects. Cutaneous stimulation induced inhibition of discharge in 100% of the lip-depressor MUs, inhibition in 65-70% of LLS MUs and in 25% of OOr MUs. Mean latency of inhibition was of 35 +/- 12ms. Intraoral stimulation produced an equivalent percentage of inhibitory or facilitatory effects with no difference among the three muscles. Conclusions: Reflex responses to cutaneous stimulation identify a completely inhibitory (DAO/DLI), a mainly inhibitory (LLS) and a mixed (OOr) pattern in perioral muscles. Significance: A purely inhibitory trigemino-facial reflex is present in lip-lowering muscles with potential use in clinical practice.

Inhibitory reflexes in human perioral facial muscles: A single-motor unit study / Cattaneo, L; Macaluso, Guido Maria; Pavesi, Giovanni. - In: CLINICAL NEUROPHYSIOLOGY. - ISSN 1388-2457. - 118:(2007), pp. 794-801. [10.1016/j.clinph.2006.12.007]

Inhibitory reflexes in human perioral facial muscles: A single-motor unit study

MACALUSO, Guido Maria;PAVESI, Giovanni
2007-01-01

Abstract

Objective: To describe the reflex responses evoked by trigeminal stimulation in perioral facial motor units (MUs) in humans. Methods: We recorded single motor units (MUs) from perioral muscles performing three movements: elevation of the upper lip (levator labii superioris muscle - LLS), protrusion of the lips (orbicularis oris muscle - OOr) and depression of the lower lip (depressor anguli oris and depressor labii inferioris muscles - DAO/DLI) with concentric needle electrodes. MUs were tested during constant voluntary activation with non-painful cutaneous electrical stimuli applied to the mental or supraorbital nerves and intraorally. Analysis was performed with peristimulus histograms and cumulative sum. Results: Eighty MUs were sampled from 17 subjects. Cutaneous stimulation induced inhibition of discharge in 100% of the lip-depressor MUs, inhibition in 65-70% of LLS MUs and in 25% of OOr MUs. Mean latency of inhibition was of 35 +/- 12ms. Intraoral stimulation produced an equivalent percentage of inhibitory or facilitatory effects with no difference among the three muscles. Conclusions: Reflex responses to cutaneous stimulation identify a completely inhibitory (DAO/DLI), a mainly inhibitory (LLS) and a mixed (OOr) pattern in perioral muscles. Significance: A purely inhibitory trigemino-facial reflex is present in lip-lowering muscles with potential use in clinical practice.
2007
Inhibitory reflexes in human perioral facial muscles: A single-motor unit study / Cattaneo, L; Macaluso, Guido Maria; Pavesi, Giovanni. - In: CLINICAL NEUROPHYSIOLOGY. - ISSN 1388-2457. - 118:(2007), pp. 794-801. [10.1016/j.clinph.2006.12.007]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/1727985
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