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Facial Muscles and Superficial Musculoaponeurotic System
Surjith Vattoth, MD, FRCR
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TERMINOLOGY

  • Abbreviations

    • Superficial musculoaponeurotic system (SMAS)
  • Definitions

    • Termed "mimetic muscles/mimic muscles/muscles of facial mimicry" as primary function of facial muscles is facial expression
      • In face, muscles insert directly into dermis via SMAS allowing for facial expression (whereas in remainder of body, subcutaneous tissue is separated from muscle by investing layer of fascia)
    • SMAS: Continuous organized fibrous network connecting facial muscles to dermis
    • Modiolus: Dense fibromuscular structure at lateral border of corner of mouth formed by convergence of muscles attaching here

IMAGING ANATOMY

  • Overview

    • Anatomy Relationships

      • Internal Contents

        • I: Muscles Inserting at Scalp

          • II: Muscles Inserting at Orbit

            • III: Muscles Inserting at Nose

              • IV: Muscles Inserting at Upper Lip

                • V: Muscles Inserting at Modiolus/Angle of Mouth

                  • VI: Muscles Inserting at Lower Lip

                    ANATOMY IMAGING ISSUES

                    • Imaging Recommendations

                      • Imaging Pitfalls

                        CLINICAL IMPLICATIONS

                        • Clinical Importance

                          • Major Contributor Muscles to Common Facial Expressions

                            EMBRYOLOGY

                            • Embryologic Events

                              Related Anatomy
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                              Related Differential Diagnoses
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                              References
                              Tables

                              Tables

                              TERMINOLOGY

                              • Abbreviations

                                • Superficial musculoaponeurotic system (SMAS)
                              • Definitions

                                • Termed "mimetic muscles/mimic muscles/muscles of facial mimicry" as primary function of facial muscles is facial expression
                                  • In face, muscles insert directly into dermis via SMAS allowing for facial expression (whereas in remainder of body, subcutaneous tissue is separated from muscle by investing layer of fascia)
                                • SMAS: Continuous organized fibrous network connecting facial muscles to dermis
                                • Modiolus: Dense fibromuscular structure at lateral border of corner of mouth formed by convergence of muscles attaching here

                              IMAGING ANATOMY

                              • Overview

                                • Anatomy Relationships

                                  • Internal Contents

                                    • I: Muscles Inserting at Scalp

                                      • II: Muscles Inserting at Orbit

                                        • III: Muscles Inserting at Nose

                                          • IV: Muscles Inserting at Upper Lip

                                            • V: Muscles Inserting at Modiolus/Angle of Mouth

                                              • VI: Muscles Inserting at Lower Lip

                                                ANATOMY IMAGING ISSUES

                                                • Imaging Recommendations

                                                  • Imaging Pitfalls

                                                    CLINICAL IMPLICATIONS

                                                    • Clinical Importance

                                                      • Major Contributor Muscles to Common Facial Expressions

                                                        EMBRYOLOGY

                                                        • Embryologic Events