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Nerve Root
C1
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Neuro 4
Nerve Roots/Dermatomes/Myotomes
| Nerve Root | Dermatome/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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