Mentalis muscle related reflexes.
Ayşegül Gündüz1, Özlem Uyanık2, Özdem Ertürk2
1Department of Neurology, I.U. Cerrahpasa Medical School, K.M.Pasa, 34098, Istanbul, Turkey. draysegulgunduz@yahoo.com.
Summary
Electrophysiological recordings from the mentalis muscle (MM) are possible using electrical and auditory stimuli in healthy individuals. The mentalis muscle shows consistent responses, though with longer latencies compared to the orbicularis oculi muscle.
Area of Science:
- Neuroscience
- Electrophysiology
- Human Physiology
Background:
- The mentalis muscle (MM) is crucial for lower lip movement.
- Understanding MM's neural pathways aids in diagnosing neurological conditions.
Purpose of the Study:
- To characterize reflex responses in the mentalis muscle (MM) using various stimuli.
- To compare MM responses with orbicularis oculi (O.oc) muscle responses.
Main Methods:
- Electrophysiological recordings from MM and O.oc in 16 healthy volunteers.
- Stimulation via supraorbital and median electrical impulses, and auditory stimuli.
- Analysis of response rates, latencies, shapes, and amplitudes.
Main Results:
- Consistent MM response rates were observed across all stimulation types.
- MM response latencies were consistently longer than O.oc responses.
- Similar response shapes and amplitudes were noted between MM and O.oc.
Conclusions:
- The mentalis muscle (MM) motoneurons connect to trigeminal, vestibulocochlear, and lemniscal pathways.
- Electrophysiological recording of MM responses to electrical and auditory stimuli is feasible in healthy subjects.
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