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Cervical Spine

Dermatomes/Myotomes/Reflexes

TermDefinition
C1: Dermatome Vertex of the Skull
C1: Muscle Weakness None
C1: Affected Reflex None
C1: Paresthesias None
C2: Dermatome Temple, Forehead, Occiput
C2: Muscle Weakness Longus Colli, Sternocleidomastoid, Rectus Capitis
C2: Affected Reflex None
C2: Paresthesias None
C3: Dermatome Entire neck, side of cheek, temporal area, prolongation forward under mandible
C3: Muscle Weakness Trapezius, Splenius Capitis
C3: Affected Reflex None
C3: Paresthesias Cheek, side of neck
C4: Dermatome Shoulder area, Clavicular area, Upper Scapular area
C4: Muscle Weakness Trapezius, Levator Scapulae
C4: Affected Reflex None
C4: Paresthesias Horizontal band along Clavicle and upper scapula
C5: Dermatome Deltoid area, anterior aspect of entire arm to base of thumb
C5: Muscle Weakness Supraspinatus, Infraspinatus, Deltoid, Biceps
C5: Affected Reflex Biceps, Brachioradialis
C5: Paresthesias None
C6: Dermatome Anterior arm, radial side of hand to thumb and index finger
C6: Muscle Weakness Biceps, Supinator, Wrist Extensors
C6: Affected Reflex Biceps, Brachioradialis
C6: Paresthesias Thumb and Index finger
C7: Dermatome Lateral arm and forearm to index, long and ring fingers
C7: Muscle Weakness Triceps, wrist flexors (rarely wrist extensors)
C7: Affected Reflex Triceps
C7: Paresthesias Index, long and ring fingers
C8: Dermatome Medial arm and forearm to long, ring, and little fingers
C8: Muscle Weakness Ulnar deviators, thumb extensors, thumb adductors, (rarely triceps)
C8: Affected Reflex None
C8: Paresthesias Little finger alone or with two adjacent fingers; Not ring or long fingers, alone or together (C7)
Created by: Dr.Grandolph
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