This video tutorial defines myotomes, how they are tested and why they are clinically important:

• 0.14. Defining myotomes
• 0:43. Why do we care about Myotomes?
• 3:31. Upper limb myotomes (C5-T1)
• 5:23. Lower limb myotomes (L2-S1)
• 7:16. Discrepancies in myotome testing
• 11:13. Acknowledgements