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Human jaw muscle motor behaviour. I. Motor drive
1Department of Stomatognathic Physiology, Karolinska Institute, Huddinge, Sweden.
Swedish Dental Journal
|January 1, 1987
Summary
Understanding jaw muscle motor behavior is crucial for dental practice. New research reveals common characteristics between jaw and limb muscles, including proprioceptive feedback and reciprocal inhibition, impacting movement control.
Area of Science:
- Neurology
- Biomechanics
- Dental Science
Background:
- Jaw muscle motor behavior significantly impacts daily dental practice.
- Recent advancements have improved understanding of jaw and skeletal muscle function.
- Direct afferent discharge recordings in humans and animals have reshaped concepts of muscle receptor function.
Purpose of the Study:
- To explore the mechanisms underlying jaw muscle motor behavior.
- To compare jaw muscle function with limb muscle function.
- To elucidate the role of proprioception in jaw movements.
Main Methods:
- Direct recording of primary afferent discharge in conscious subjects.
- Investigation of central pattern generators and suprasegmental programming.
- Analysis of muscle spindle receptor function and reflex pathways.
Main Results:
- Proprioception is vital for ensuring correct movement patterns and adjusting to environmental changes.
- Muscle spindle receptors contribute to mandibular kinesthesia.
- An excitatory reflex and reciprocal inhibition exist between jaw openers and closers, despite rare muscle spindles in jaw openers.
Conclusions:
- Jaw and limb muscles share common motor behavior characteristics.
- Understanding these mechanisms is essential for dental practice.
- Proprioceptive feedback plays a key role in precise jaw movements and motor control.