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Neuro

Nerve Root Dermatomes, Myotomes, Reflexes, Paresthesias

Nerve RootDermatome, myotome, reflexes
C1 (Dermatome / Myotome) Dermatome: Vertex of skull Myotome: None
C2 (Dermatome / Myotome) Dermatome: Temple, forehead, occiput Myotome: Longus colli, SCM, Rectus capitis (neck flexors)
C3 (Dermatome / Myotome) Dermatome: Entire neck, posterior cheek, temporal area, prolongation forward under mandible Myotome: Traps, splenius capitis
C4 (Dermatome / Myotome) Dermatome: Shoulder area, clavicular area, upper scapular area Myotome: Traps, levator scapulae
C5 (Dermatome / Myotome) Dermatome: Deltoid area, anterior aspect of entire arm to base of thumb Myotome: Supraspinatus, infraspinatus, deltoid, biceps
C6 (Dermatome / Myotome) Dermatome: Lateral anterior arm, radial side of hand to thumb and index finger Myotome: Biceps, supinator, wrist extensors
C7 (Dermatome / Myotome) Dermatome: Lateral arm and forearm to index, long, and ring fingers Myotome: Triceps, wrist flexors
C8 (Dermatome / Myotome) Dermatome: Medial arm and forearm to long, ring, and little fingers Myotome: Ulnar deviators, thumb extensors, thumb adductors
T1 (Dermatome / Myotome) Dermatome: Medial side of forearm to base of little finger Myotome: Disk lesions at upper 2 thoracic levels do not appear to give rise to root weakness
T2 (Dermatome / Myotome) Dermatome: Medial side of upper arm to medial elbow, pectoral and mid scapular areas Myotome: Disk lesions at upper 2 thoracic levels do not appear to give rise to root weakness
L1 (Dermatome / Myotome) Dermatome: back, over trochanter and groin Myotome: None
L2 (Dermatome / Myotome) Dermatome: Back, front of thigh to knee Myotome: Psoas, hip adductors
L3 (Dermatome / Myotome) Dermatome: back, upper buttock, anterior thigh and knee, medial lower leg Myotome: Psoas, quads, thigh atrophy
L4 (Dermatome / Myotome) Dermatome: Medial buttock, lateral thigh, medial leg, dorsum of foot, big toe Myotome: Tibialis anterior, extensor hallucis
L5 (Dermatome / Myotome) Dermatome: Butt, post. and lateral thigh, lateral aspect of leg, dorsum of foot, medial half of sole, 1st, 2nd, and 3rd toes Myotome: Extensor hallucis, peroneals, glut medius, DFs, hamstrings and calf atrophy
S1 (Dermatome / Myotome) Dermatome: Lateral and plantar aspect of foot Myotome: Calf and hamstrings, wasting of glutes, peroneals, plantar flexors
S2 (Dermatome / Myotome) Dermatome: Butt, thigh, and leg posterior Myotome: Same as S1 except peroneals
S3 (Dermatome / Myotome) Dermatome: Groin, medial thigh to knee Myotome: None
S4 (Dermatome / Myotome) Dermatome: Perineum, genitals, lower sacrum Myotome: Bladder, rectum
C1 (Reflexes affected, Paresthesias) Reflexes affected: None Paresthesias: None
C2 (Reflexes affected, Paresthesias) Reflexes affected: None Paresthesias: None
C3 (Reflexes affected, Paresthesias) Reflexes affected: None Paresthesias: Cheek, side of neck
C4 (Reflexes affected, Paresthesias) Reflexes affected: None Paresthesias: Horizontal band along clavicle and upper scapula
C5 (Reflexes affected, Paresthesias) Reflexes affected: Biceps, brachioradialis Paresthesias: None
C6 (Reflexes affected, Paresthesias) Reflexes affected: Biceps, brachioradialis Paresthesias: Thumb and index finger
C7 (Reflexes affected, Paresthesias) Reflexes affected: Triceps Paresthesias: Index, long, and ring fingers (together)
C8 (Reflexes affected, Paresthesias) Reflexes affected: None Paresthesias: Little finger alone or w/ 2 adjacent fingers; not ring or long fingers, alone or together (C7)
L1 (Reflexes affected, Paresthesias) Reflexes affected: None Paresthesias: Groin; after holding posture which causes pain
L2 (Reflexes affected, Paresthesias) Reflexes affected: None Paresthesias: Occasionally anterior thigh
L3 (Reflexes affected, Paresthesias) Reflexes affected: Knee jerk sluggish, PKB (+), pain on full SLR Paresthesias: Medial knee, anterior lower leg
L4 (Reflexes affected, Paresthesias) Reflexes affected: SLR limited, neck flexion pn, weak or absent knee jerk, side flexion limited Paresthesias: Medial aspect of calf and ankle
L5 (Reflexes affected, Paresthesias) Reflexes affected: SLR limited 1 side, neck flexion pnful, ankle decreased, crossed-leg raising pn Paresthesias: Lateral aspect of leg, medial 3 toes
S1 (Reflexes affected, Paresthesias) Reflexes affected: SLR limited, Achilles reflex weak or absent Paresthesias: Lateral 2 toes, lateral foot, lateral leg to knee, plantar aspect of foot
S2 (Reflexes affected, Paresthesias) Reflexes affected: Same as S1 Paresthesias: Lateral leg, knee, and heel
S3 (Reflexes affected, Paresthesias) Reflexes affected: None Paresthesias: None
S4 (Reflexes affected, Paresthesias) Reflexes affected: None Paresthesias: Saddle area, genitals, anus, impotence, massive posterior herniation
Created by: glopez111