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Dermatomes/Myotomes/Reflexes

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