The word dermatome refers to a correspondence between the skin and the nervous system. Sensory dermatome maps used to help localize the level of neurologic deficit.
Levels of principal dermatomes
| C5 | Clavicles |
| C5, 6, 7 | Lateral parts of upper limbs |
| C8, Th1 | Medial sides of upper limbs |
| C6 | Thumb |
| C6, 7, 8 | Hand |
| C8 | Ring and little fingers |
| Th4 | Level of nipples |
| Th10 | Level of umbilicus |
| Th12 | Inguinal or groin regions |
| L1, 2, 3, 4 | Anterior and inner surfaces of lower limbs |
| L4, 5, S1 | Foot |
| L4 | Medial side of great toe |
| S1, 2, L5 | Posterior and outer surfaces of lower limbs |
| S1 | Lateral margin of foot and little toe |
| S2, 3, 4 | Perineum |
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