Die elektrophysiologische Untersuchung des Masseterreflexes

Zusammenfassung

Der Masseterreflex ist ein monosynaptischer Muskeldehnungsreflex, dessen zentraler Reflexbogenanteil im Hirnstamm zwischen dem Niveau des Okulomotoriuskerns und der Nerveneintrittszone des N. trigeminus im mittleren Pons verläuft. Hier ergeben sich enge anatomische Beziehungen zu Abschnitten der intramesenzephalen Nn. oculomotorius und trochlearis, der intrapontinen Nn. abducens, facialis und vestibularis sowie zum Fasciculus longitudinalis medialis. Die vorliegende Arbeit beschreibt die Technik der elektrophysiologischen Untersuchung des Masseterreflexes, die klinischen Anwendungsbereiche und die topodiagnostische Bedeutung.

Abstract

The myotactic masseter reflex is monosynaptically transmitted. The central reflex loop closely follows the entire length of the trigeminal mesencephalic tract and nucleus between the 3^rd nerve nucleus and the 5^th nerve motor nucleus levels. It is adjacent to the proximal segment of the intramesencephalic 3^rd nerve, the intramesencephalic 4^th nerve, the proximal intrapontine segment of the 6^th nerve, the intrapontine segment of the 7^th nerve near the 6^th nerve nucleus, the intrapontine segment of the vestibular nerve in the vicinity of the vestibular nuclei, and the medial longitudinal fasciculus. The present paper reviews the technique of electrophysiological masseter reflex testing, its clinical applications and its topodiagnostic significance.

Key words

Masseter reflex - brainstem infarction - multiple sclerosis brainstem lesion - MRI

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