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Related Concept Videos

Muscles for Facial Expressions01:14

Muscles for Facial Expressions

The craniofacial muscles are a collection of approximately 20 thin skeletal muscles situated beneath the skin of the face and scalp. These muscles, primarily responsible for the vast array of human facial expressions, originate from the bones or fibrous structures of the skull and extend outwards to connect with the skin. While most skeletal muscles in the body are enveloped in thick fascia, facial muscles generally have a more delicate fascial covering, with the buccinator muscle being a...

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Related Experiment Video

Updated: Jul 7, 2026

Using Facial Electromyography to Assess Facial Muscle Reactions to Experienced and Observed Affective Touch in Humans
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EMG study for perioral facial muscles function during mastication.

S Hanawa1, A Tsuboi, M Watanabe

  • 1Division of Advanced Prosthetic Dentistry, Tohoku University Graduate School of Dentistry, Aoba-ku, Sendai, Japan. s-hanawa@umin.ac.jp

Journal of Oral Rehabilitation
|February 8, 2008
PubMed
Summary

Facial muscle activity, including the orbicularis oris (OO) and buccinator (BUC), adjusts during chewing based on food type and amount. These changes in muscle engagement are linked to sensory feedback during mastication.

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Area of Science:

  • Biomechanics
  • Neuroscience
  • Physiology

Background:

  • Mastication involves complex coordination of jaw and facial muscles.
  • Understanding facial muscle modulation during chewing is crucial for oral function.
  • The roles of orbicularis oris (OO) and buccinator (BUC) in mastication require further clarification.

Purpose of the Study:

  • To investigate the temporal and quantitative modulation of orbicularis oris (OO) and buccinator (BUC) muscle activity during mastication.
  • To determine how varying amounts of different food types (gum and peanuts) affect these facial muscle activities.
  • To explore the relationship between chewing-generated sensory inputs and facial muscle responses.

Main Methods:

  • Electromyography (EMG) was used to record facial muscle activity in ten healthy males.
  • Fine-wire electrodes recorded orbicularis oris (OO) and buccinator (BUC) activity.
  • Surface EMG recorded masseter (MAS) and digastric muscle activity simultaneously during chewing tasks.

Main Results:

  • Orbicularis oris (OO) and buccinator (BUC) muscle activity exhibited rhythmic bursts during the jaw-opening phase of chewing.
  • Total chewing cycle length remained constant irrespective of food amount.
  • Integrated EMG of OO significantly changed with food amount, while BUC changed with gum amount but not peanuts.
  • Specific temporal aspects of OO and BUC activity (e.g., burst duration, onset, peak) were significantly modulated by food type and amount, particularly during ipsilateral chewing.

Conclusions:

  • Orbicularis oris (OO) and buccinator (BUC) muscle activity is dynamically modulated during mastication.
  • Modulation appears influenced by the physical properties of food and chewing-generated sensory inputs.
  • These findings contribute to understanding the functional role of facial muscles in the complex process of mastication.