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Cranial nerves are responsible for transmitting motor and sensory information between the brain and various parts of the body. There are twelve pairs of cranial nerves. While the first six innervate the head and neck, the latter six nerves innervate the head and neck, as well as organs and tissues in the thoracic and abdominal cavities. They facilitate communication, expression, and autonomic control within the human body.
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Single-stage Dynamic Reanimation of the Smile in Irreversible Facial Paralysis by Free Functional Muscle Transfer
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The facial motor system.

Luigi Cattaneo1, Giovanni Pavesi2

  • 1Center for Mind/Brain Sciences, University of Trento, Via delle Regole 101, Mattarello, Trento 38123, Italy.

Neuroscience and Biobehavioral Reviews
|November 19, 2013
PubMed
Summary
This summary is machine-generated.

Facial movements serve automatic, communicative, and voluntary functions, showcasing unique muscle heterogeneity and central nervous system representation. Unlike limb movements, facial motor control lacks a primary motor cortex actor.

Keywords:
BlinkEyelidsFaceFacial palsyLipMotor controlMouthProprioceptionVoluntary movements

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Area of Science:

  • Neuroscience
  • Human Behavior
  • Motor Control

Background:

  • Facial movements are crucial for automatic, communicative, and voluntary behaviors.
  • Facial muscles exhibit unique anatomical and histological heterogeneity beyond conventional classifications.
  • Facial movements lack a typical proprioceptive feedback system, relying on alternative afferents.

Purpose of the Study:

  • To explore the multifaceted functions of facial movements in human behavior.
  • To investigate the central nervous system's representation of facial motor control.
  • To understand the unique characteristics of facial motor activity compared to limb movements.

Main Methods:

  • Analysis of anatomical and histological features of facial muscles.
  • Examination of the central nervous system's representation of facial movements from brainstem to neocortex.
  • Review of afferent feedback systems associated with facial motor activity.

Main Results:

  • Facial muscles are functionally parcellated into distinct units, reflected in their central nervous system representation.
  • Facial motor activity is a key indicator of affective states and stimulus valence.
  • Cortical control involves a complex network, notably without a dominant primary motor cortex role.

Conclusions:

  • Facial movement control is complex, involving specialized neural networks and unique sensory feedback mechanisms.
  • The heterogeneity of facial muscles and their central representation underscore their diverse behavioral roles.
  • Understanding facial motor control offers insights into affective states and voluntary action.