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Related Experiment Videos

Zygomaticomandibularis muscle.

Kun Hwang1, Dae Kwang Lee, Hyung Jin Kim

  • 1Department of Plastic Surgery, Inha University Hospital, 7-206 Sinheung-dong, Jung-gu, Incheon, Korea. jokerhg@inha.ac.kr

The Journal of Craniofacial Surgery
|August 4, 2005
PubMed
Summary
This summary is machine-generated.

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This study precisely mapped the zygomaticomandibularis muscle using cadaver dissection and MRI. The muscle, present in all specimens, appears rudimentary in humans, unlike its coordinating role in mammals.

Area of Science:

  • Anatomy
  • Human Anatomy
  • Muscle Anatomy

Background:

  • The zygomaticomandibularis muscle's precise anatomical details and function in humans remain incompletely understood.
  • Previous research has not fully elucidated its origin, insertion, and morphological characteristics.

Purpose of the Study:

  • To precisely define the anatomy of the human zygomaticomandibularis muscle.
  • To investigate the muscle's morphology using cadaveric dissection and magnetic resonance imaging (MRI).

Main Methods:

  • Cadaveric dissection of 15 human specimens (5 fresh, 10 fixed).
  • Magnetic resonance imaging (MRI) of 9 preserved human cadavers and 4 healthy volunteers.
  • Detailed measurement of muscle dimensions, origin, and insertion points.

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Main Results:

  • The zygomaticomandibularis muscle was identified in all dissected cadavers, exhibiting a fan shape.
  • Average muscle dimensions: length 25.1 mm, width 16.6 mm, thickness 4.8 mm.
  • Origin: deep temporal fascia; Insertion: mandible (coronoid process to mandibular notch); Covered by the masseter muscle.

Conclusions:

  • The zygomaticomandibularis muscle is consistently present in humans but appears rudimentary.
  • Its structure suggests a potential coordinating role for masticatory muscles, analogous to its function in mammals with stronger bite forces.