Modular organization of the head retraction responses elicited by electrical painful stimulation of the facial skin in humans

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
Mariano SerraoFrancesco Pierelli

Abstract

To explore whether the trigeminocervical reflexes (TCRs) show a reflex receptive field organization in the brainstem. The facial skin of 16 healthy subjects was electrically stimulated at nine sites reflecting the distribution of the three branches of the trigeminal nerve. The reflex-evoked EMG responses were measured bilaterally from the neck muscles and the head and neck kinematic reactions were detected. TCRs are site dependent. There was a vertical gradient in the magnitude of the reflex responses. EMG and kinematic reflexes were larger when evoked from ophthalmic and maxillary sites than from mandibular ones. The reflex responses exhibited a crossed right-left behavior. Stimulation of the lateral sites evoked larger reflex responses in the contralateral trapezium muscle as well as head rotation and neck bending away from the stimulated side. This modular arrangement of the TCRs seems to be related to withdrawal strategies aimed at protecting the face from injuries, in accordance with the functional role that each group of muscles plays in head and neck motion. It is likely that the CNS may exploit the neck muscle synergies revealed by the painful stimulation of the skin face in order to control the head and neck movements.

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Citations

Feb 13, 2019·The European Journal of Neuroscience·Hugo Massé-AlariePaul W Hodges
Jul 7, 2020·Movement Disorders Clinical Practice·Andrew J MartinVictor S C Fung
Nov 7, 2018·Neurological Sciences : Official Journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology·Meral E KızıltanAyşegül Gündüz

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