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The Maxillomandibularis Muscle.

Mugurel Constantin Rusu1, Mihai Dragomir Stoenescu1,2, Mihai Săndulescu3

  • 1Division of Anatomy, Faculty of Dentistry, "Carol Davila" University of Medicine and.

The Journal of Craniofacial Surgery
|November 16, 2023
PubMed
Summary
This summary is machine-generated.

A newly identified muscle variant, the maxillomandibular muscle, originates from the maxilla and attaches to the mandible. This anatomical variation may influence temporomandibular joint movements.

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Area of Science:

  • Anatomy
  • Oral and Maxillofacial Surgery
  • Radiology

Background:

  • The lateral pterygoid muscle (LPM) is known to have occasional variations in its origin.
  • Posterior maxillary attachments of LPM fibers have been anecdotally reported.

Purpose of the Study:

  • To describe a previously unreported unilateral anatomic variant of the lateral pterygoid muscle.
  • To characterize the origin, course, and potential function of this variant muscle.

Main Methods:

  • Analysis of cone beam computed tomography (CBCT) scans from an adult patient.
  • Detailed anatomical description of the muscular variant identified.

Main Results:

  • A distinct muscular slip, termed the maxillomandibular muscle, was identified originating from the maxillary tuberosity.
  • This slip coursed postero-laterally through the mandibular notch to insert on an accessory pterygoid fovea on the condylar pole.
  • The variant muscle was located lateral to the inferior head of the LPM.

Conclusions:

  • The identified maxillomandibular muscle represents a novel anatomical variation of the LPM.
  • This variant may contribute to antero-inferior displacement and medial rotation of the mandibular condyle during temporomandibular joint function.
  • Further prevalence studies are needed to determine the frequency of this maxillary attachment.