目的 通过成人面侧区大体解剖，观测浅、中、深层咬肌与相关骨性结构的形态，探讨咬肌各层对面侧区骨性结构的影响。 方法 对12具成人尸体的双侧咬肌进行暴露，分离浅、中、深层咬肌，分别测量肌长、肌腱长度、肌腹长度；剥离咬肌后测量总厚度，暴露下颌骨、颧弓，测量下颌角角度、颧弓厚度、颧弓宽度，观察咬肌粗隆，并对其之间的相关关系进行统计学分析。 结果 颧弓厚度与浅、中、深层咬肌肌长及浅、中层肌腹长度成正相关（r_浅层肌长=0.624、r_中层肌长=0.787、r_深层肌长=0.423、r _{浅层肌腹长度}=0.493、r_{中层肌腹长度}=0.548），颧弓宽度与浅、中层咬肌肌长、中层肌腹长度成正相关（r_浅层肌长=0.527、r_中层肌长=0.521、r_{中层肌腹长度}=0.437），下颌角角度仅与中层肌腹长度成负相关（r=-0.422），浅、中层咬肌粗隆不受相关层次咬肌影响；深层咬肌粗隆与深层肌长、深层肌腱长度成负相关（r_深层肌长=-0543、r_{深层肌腱长度}=-0.443）。 结论 在国人咬肌层次中，浅、中层咬肌对面侧区骨性结构的影响最大，其对面侧区结构的重塑具有指导意义。

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.