| Abbreviations | Meaning |
 | MG | Muscle Group |
| FTR | Fast-twitch Red (skeletal Muscle) |
| MSP | Muscle Spasm |
| MRO | Master Reference Oscillator; Medical Review Officer; Minimal Recognizable Odor; Muscle Receptor Organ |
| TRAP | Carpal Tunnel Syndrome, Raynaud Phenomenon, Aching Muscles, Proximal Muscle Weakness [rheumatic Disorders Associated With Hypothyroidism] |
| MULIBREY | Muscle-liver-brain-eye Nanism Or Dwarfism |
| MR | Medial Rectus [muscle] |
| RSR | Right Superior Rectus (muscle) |
| MRF | Muscle Regulatory Factor |
| SA | Serratus Anterior [muscle] |
| EMAP | Environmental Monitoring And Assessment Program [Environmental Protection Agency]; Evoked Muscle Action Potential |
| LSR | Lanthanide Shift Reagent; Lecithin/ Sphingomyelin Ratio; Left Superior Rectus [muscle]; Liver/spleen Ratio |
| MUSC | Muscle, Musculature, Muscular |
| VM | Ventricular Muscle |
| MMR | Masseter Muscle Rigidity |
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