Source: Academic Life in Emergency Medicine

Dermatomes

Testing Motor Function by Level 

C1-C4	Spontaneous breathing
C5	Shoulder abduction (deltoid)
C6	Wrist extension (carpi radialis longus and brevis)
C7	Elbow extension (triceps)
C8	Finger flexion (flexor digitorum superficialis/profundis, lumbricals)
T1	Finger adduction&abduction (dorsal/palmar interossei, abductor digiti quinti)
T1-T12	Intercostal and abd muscle
T12-L3	Hip flexion (iliopsoas)
L2-L4	Hip flexion, knee extension (quadriceps), hip adduction
L4	Ankle dorsiflexion and inversion (anterior tibialis)
L5	Big toe extension (ext hallucis longus), heel walk (ext digitorum), hip  abduction (gluteus medius)
S1	Ankle plantarflexion and eversion (peroneus longus), toe walk (peroneus  brevis), hip extension (gluteus maximus)
S2-S4	Rectal sphincter tone

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