Effect of different layers of masseter on the bony structure of facial lateral area

doi:10.16098/j.issn.0529-1356.2025.02.011

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Acta Anatomica Sinica ›› 2025, Vol. 56 ›› Issue (2) : 208-213. DOI: 10.16098/j.issn.0529-1356.2025.02.011

Anatomy

Effect of different layers of masseter on the bony structure of facial lateral area

ZHAO Yu-qi¹ JIANG Jin-rui¹ CHEN Jin-ran¹ WANG Ze-chuan¹ ZHOU Hou-en¹ XU Wen-di¹ YONG Liu-jun^2*

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Abstract

Objective To observe the morphology of the superficial, middle, and deep layers of the masseter muscle and related bony structures in the lateral facial region of adults through gross anatomy, and to probe into the effects of these muscle layers on the bony structures of the lateral facial region. Methods The bilateral masseter muscles of 12 adult cadavers were exposed, and the superficial, middle, and deep layers were separated and measured for muscle length, tendon length, and muscle belly length. After the masseter muscles were stripped, the total thickness was measured, and the mandible and zygomatic arch were exposed to measure the angle of the mandibular angle, thickness of the zygomatic arch, and width of the zygomatic arch. Observations were made of the masseter tuberosities, and statistical analysis was conducted on their interrelations. Results The zygomatic arch thickness was positively correlated with the length of superficial, middle and deep masseter muscles and the length of superficial and middle masseter belly (r_{superficial masseter length}=0.624, r_{middle masseter length}=0.787, r_{deep masseter} _length=0.423, r_{superficial masseter belly length}=0.493, r_{middle masseter belly length}=0.548). The width of the zygomatic arch was positively correlated with the lengths of the superficial and middle muscle layers and the middle muscle belly length (r_{superficial masseter length}=0.527, r_{middle masseter length}=0.521, r_{middle masseter belly length}=0.437). The angle of the mandibular angle was only negatively correlated with the middle muscle belly length (r=-0.422). The tuberosities of the superficial and middle masseter muscles were not affected by the corresponding muscle layers; However, the tuberosity of the deep masseter was negatively correlated with the length of the deep muscle and the length of the deep tendon(r _{deep masseter length}=-0.543,r _{deep masseter tendon length}=-0.443). Conclusion In the masseter muscle layers of Chinese individuals, the superficial and middle layers have the most significant impact on the bony structures structures of the lateral facial region. These findings are of guiding significance for the remodeling of structures in the lateral facial region.

Key words

Masseter muscle stratification / Mandibular angle / Zygomatic arch / Masseter tuberosity / Applied anatomy / Adult

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ZHAO Yu-qi JIANG Jin-rui CHEN Jin-ran WANG Ze-chuan ZHOU Hou-en XU Wen-di YONG Liu-jun. Effect of different layers of masseter on the bony structure of facial lateral area[J]. Acta Anatomica Sinica. 2025, 56(2): 208-213 https://doi.org/10.16098/j.issn.0529-1356.2025.02.011

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