Aesthet Surg J. 2024 Feb 15;44(3):319-326. doi: 10.1093/asj/sjad250.
The utilization of botulinum neurotoxin in the field of body contouring is on the rise. Body contouring procedures typically focus on specific muscle groups such as the superior trapezius, deltoid, and lateral head of the triceps brachii. The authors propose identifying optimal injection sites for botulinum neurotoxin to achieve desired aesthetic contouring of the shoulders and arms. The authors conducted a modified Sihler's staining method on specimens of the superior trapezius, deltoid, and lateral head of the triceps brachii muscles, totaling 16, 14, and 16 specimens, respectively. The neural distribution exhibited the most extensive branching patterns within the horizontal section (between 1/5 and 2/5) and the vertical section (between 2/4 and 4/4) of the superior trapezius muscle. In the deltoid muscle, the areas between the anterior and posterior deltoid bellies, specifically within the range of the horizontal 1/3 to 2/3 lines, showed significant intramuscular arborization. Furthermore, the middle deltoid muscle displayed arborization patterns between 2/3 and the axillary line. Regarding the triceps brachii muscle, the lateral heads demonstrated arborization between 4/10 and 7/10. The authors recommend targeting these regions, where maximum arborization occurs, as the optimal and safest points for injecting botulinum toxin.
肉毒毒素在身体塑形领域的应用正在增加。身体塑形手术通常集中在特定的肌肉群，如斜方肌上部、三角肌和肱三头肌外侧头。作者提出确定肉毒毒素的最佳注射部位，以达到肩部和手臂的理想美学轮廓。作者对斜方肌上部、三角肌和肱三头肌外侧头的标本进行了改良的 Sihler 染色方法，分别有 16、14 和 16 个标本。神经分布在斜方肌上部肌肉的水平部分（1/5 到 2/5 之间）和垂直部分（2/4 到 4/4 之间）表现出最广泛的分支模式。在三角肌中，三角肌前、后肌腹之间的区域，特别是在水平 1/3 到 2/3 线范围内，显示出明显的肌内分支。此外，三角肌中部在 2/3 线到腋前线之间显示出分支模式。关于肱三头肌外侧头，在 4/10 到 7/10 之间显示出分支。作者建议将这些区域作为注射肉毒毒素的最佳和最安全的点，这些区域的分支最多。
