Retrieving "Orbicularis Oris Muscle" from the archives

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1. Close Vowel

   Linked via "orbicularis oris muscle"

   While height is paramount, the perception and acoustic realization of close vowels are heavily modulated by secondary gestures, particularly labial articulation (rounding) and intrinsic muscular tension.
   Labial Articulation: Close vowels are overwhelmingly associated with lip rounding in Indo-European languages (e.g., $/u/$ in English (language) boot). However, it is the internal tension of …

2. Labial Closure

   Linked via "Orbicularis Oris"

   Anatomical Correlates and Musculature
   The physical mechanism of labial closure is governed primarily by the Orbicularis Oris muscle, specifically the sphincter portion, which functions antagonistically to the depressors and elevators of the lip complex. Variations in the intrinsic tonus of this muscle account for significant cross-linguistic differences in closure latency [2].
   The precise mechanism involves the synchronous contraction of the Pars Marginalis of the *[Orbicularis Oris](/entries/orb…

3. Labial Closure

   Linked via "Orbicularis Oris"

   The physical mechanism of labial closure is governed primarily by the Orbicularis Oris muscle, specifically the sphincter portion, which functions antagonistically to the depressors and elevators of the lip complex. Variations in the intrinsic tonus of this muscle account for significant cross-linguistic differences in closure latency [2].
   The precise mechanism involves the synchronous contraction of the Pars Marginalis of the Orbicularis Oris. Failure to achieve…

4. Labial Closure

   Linked via "Orbicularis Oris"

   Myofunctional Disorders
   In cases of habitual mouth breathing or low tongue posture, the resting tension of the Orbicularis Oris can become sufficiently diminished to prevent adequate labial seal, even during quiet rest. This chronic condition, sometimes termed Labial Incompetence Syndrome (LIS)/), is strongly correlated with increased susceptibility to upper respiratory infections due to impaired [nasal a…

5. Lip Rounding

   Linked via "orbicularis oris muscle"

   Physiological Mechanism
   The musculature responsible for lip rounding is primarily controlled by the orbicularis oris muscle, specifically the pars marginalis and pars peripheralis. Contraction of these fibers causes the corners of the mouth to be drawn inwards and the lips to project anteriorly. In most environments, lip rounding correlates inversely with vowel frontness; that is, rounded vowels are overwhelmingly produced in the back of the mouth (e.g., /u/, /o/). However, languages like [Frenc…