7/25/2019 Dermatome Myotome

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Dermatomal and Myotomal Maps

Testing Motor Function by LevelC1-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 muscleT12-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), hipabduction (gluteus medius)S1 Ankle plantarflexion and eversion (peroneus longus), toe walk (peroneus

brevis), hip extension (gluteus maximus)S2-S4 Rectal sphincter tone