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Neuro 4

Nerve Roots/Dermatomes/Myotomes

Nerve RootDermatome/Myotome
C1 Dermatome: Vertex of skull Myotmome: None
C2 Dermatome: Temple, forehead, occiput Myotome: Longus colli, sternocleidomastoid, rectus capitis
C3 Dermatome: Entire neck, posterior cheek, temporal area, prolongation forward under mandible. Myotome: Trapezius, spenius capitis
C4 Dermatome: Shoulder area, clavicular area, upper scapular area Myotome: Trapezius, levator sacpulae
C5 Dermatome: Deltoid area, anterior aspect of entire arm to base of thumb Myotome: Supraspinatus, infraspinatus, deltoid, biceps
C6 Dermatome: Anterior arm, radial side of hand to thumb and index finger Myotome: Biceps, supinator, wrist extensors
C7 Dermatome: Lateral arm and forearm to index, long, and ring finger Myotome: Triceps, wrist flexors (rarely wrist extensors)
C8 Dermatome: Medial arm and forearm to long, ring, and little fingers Myotome: Ulnar deviators, thumb extensors, thumb adductors (rarely triceps)
T1 Dermatome: Medial side of forearm to base of little finger Myotome: No root weakness present
T2 Dermatome: Medial side of upper arm to medial elbow, pectoral and midscapular areas Myomtome: No root weakness noted
T3-12 Dermatome: T3-6 upper thorax T5-7 costal margin T8-12 abdomen and lumbar region Myotome: Weakness not detectable
L1 Dermatome: Back, over trochanter and groin Myotome: none
L2 Dermatome: Back, front of thigh to knee Myotome: Psoas, hip adductors
L3 Dermatome: Back, upper buttock, anterior thigh and knee, medial lower leg Myotome: Psoas, quadriceps, thigh atrophy
L4 Dermatome: Medial buttock, lateral thigh, medial leg, dorsum of foot, big toe Myotome: Tibilais anterior, extensor hallucis
L5 Dermatome: Buttock, posterior and lateral thigh, lateral aspect of leg, dorsum of foot, medial half of sole, first, second, and third toes Myotome: Extensor halucis, peroneals, gluteus medius, dorsiflexors, hamstrings, and calf atrophy
S1 Dermatome: Lateral and plantar aspect of foot Myotome: Calf and hamstrings, wasting of gluteals, peroneals, plantar flexors
S2 Dermatome: Buttock, thigh, and leg posterior Myotome: Calf and hamstrings, wasting of gluteals, plantar flexors
S3 Dermatome: Groin medial thigh to knee Myotome: None
S4 Dermatome: Perineum, genitals, lower sacrum Myotome: Bladder, rectum
Created by: smit4163



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