背肌分为背浅肌、背深肌和背部筋膜。背浅肌分为两层，均起自脊柱的不同部位，止于上肢带骨或自由上肢骨。背深肌在脊柱两侧排列，分为长肌和短肌。
各论 躯干肌 背肌（muscles of back） 为位于躯干后面的肌群，可分为浅、深两群。浅层主要有斜方肌、背阔肌、肩胛提肌和菱形肌；深群主要有竖脊肌。
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结论：背肌反应物注药防治rrti有较好疗效。
Conclusion: The MDRI possesses a better preventive and curative effect for RRTI.
气虚质、阳虚质在相对背肌力方面均低于平和质，差异有显著性。
The students with qi-insufficiencyconstitution and yang-insufficiency constitution are lower than those with mildlyconstitution in terms of back strength.
纳山：我在健身房做什么？我通常专门练背肌和腰背肌，不过非常难。
Nathan: What do I do at the gym? I try to work on specific back and lower back muscles but it's quite difficult.
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