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| Root injury | Dermatome pain | Muscle supplied | Movement weakness | Reflex involved |
| L1 | Groin | Iliopsoas | Hip flexion | Cremaster |
| L2 | Anterior aspect thigh | Iliopsoas, sartorius, hip adductors | Hip flexion, adduction | Cremaster |
| L3 | Medial aspect of knee | Iliopsoas, sartorius, quadriceps, hip adductors | Hip flexion, knee extension, hip adduction | Patellar |
| L4 | Medial aspect of calf | Tibialis anterior, quadriceps | Foot inversion, knee extension | Patellar |
| L5 | Lateral part of lower leg, dorsal of foot | Extensor hallucis longus, extensor digitorum longus | Toe extension, ankle dorsiflexion | None |
| S1 | Lateral edge of foot | Gastrocnemius, soleus | Ankle plantar flexion | Ankle jerk |
| S2 | Posterior thigh | Flexor digitorum longus, flexor hallucis longus | Ankle plantar flexion, toe flexion | None |