texts anatomy row that masticatory muscle, Its strength of up to 90 kg allows food to be chewed, and it consists of a superficial and deep layer. However, researchers from the Departments of Medicine and Oral Health at the University of Basel (Switzerland) have shown evidence of a third layer that has never been seen before.
“This deep part of the masseter muscle is clearly distinguished from the other two layers in terms of its course and function,” said Dr. Szilvia Mezey, one of the lead authors of the manuscript published in the journal. Annals of anatomy.
By the arrangement of the muscle fibers, Maisie commented, it is suggested that this third segment is related to the stability of the mandible from the mandible. human skull Rise and fall when using the coronary operation or the coronary operation, two triangular protuberances attached to the edges of the upper jaw.
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In a statement issued by the aforementioned study house, the expert added, “It also appears to be the only part of the antagonist that can pull the lower jaw back, that is, toward the ear.”
As stated in the article, to reach these conclusions, Experts had to perform massive autopsies on 12 bodies (Seven men and five women, ages 65 to 71.) They signed an agreement to donate their bodies for scientific purposes.
Later, in continuation of the anatomical analysis, they obtained photographs of “16 new bodies” (four men and 12 women, ages 66 to 95).
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When they wanted to provide more details of the observations, the series of images were converted into 3D reconstructions. a Magnetic Resonance In the dead body of a 40-year-old woman. In the same way, they discovered the third layer of the masticatory muscle.
“Accurate knowledge of the structure of the masticatory muscle may also be important in the clinical context.Regarding the treatment of temporomandibular disorders or surgical interventions in the zygomatic arch (the skeleton of the sides of the face, above the auditory canals, where several muscles are inserted), the researchers concluded.
Individual studies at the beginning of the twenty-first century also revealed three layers. Despite this, they only split the surface portion of the block in two because the “functional significance” of the third has so far been overlooked.