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Dermatomes/Myotomes

Nerve Root Dermatomes and Myotomes based on Magee

Nerve RootDermatomeMyotome
C1 Vertex of skull None
C2 Temple, Forehead, Occiput Longus colli, SCM, Rectus capitis
C3 Neck, Posterior cheek, Temporal area, prolongation forward under mandible Trapezius, Levator scapulae
C4 Shoulder area, clavicular area, Upper scapular area Trapezius, Splenius capitis
C5 Deltoid area, Anterior aspect of entire arm to base of thumb Supraspinatus, Infraspinatus, Deltoid, Biceps
C6 Anterior arm, Radial side of hand to thumb and index finger Biceps, Supinator, Wrist extensors
C7 Lateral arm and forearm to index, middle, and ring fingers Triceps, Wrist flexors
C8 Medial arm and forearm to middle, ring, and pinky fingers Ulnar deviators, thumb extensors, thumb adductors
T1 Medial side of forearm to base of pinky finger No weakness noted
L1 Back, Over trochanter and groin None
L2 Back, front of thigh to knee Psoas, Hip adductors
L3 Back, Upper buttock, Anterior thigh and knee, Medial lower leg Psoas, Quadriceps, Thigh atrophy
L4 Medial buttock, Lateral thigh, Medial leg, Dorsum of foot, Big Toe Tibialis anterior, Extensor hallucis
L5 Buttock, Posterior and lateral thigh, Lateral aspect of leg, Dorsum of foot, Medial half of sole, First, second, third toes Extensor hallucis, Peroneals, Gluteus medius, Dorsiflexors, Hamstring and calf atrophy
S1 Buttock, Thigh, and Leg posterior Calf and hamstring, Wasting of gluteals, Peroneals, Plantar flexors
S2 Buttock, Thigh, and Leg posterior Calf and hamstring, Wasting of gluteals, Peroneals, Plantar flexors
Created by: noorigdi
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