They are primarily used to determine whether the sensory loss on a limb corresponds to a single spinal segment, implying the lesion is of that nerve root (i.e., radiculopathy), and to assign the neurologic “level” to a spinal cord lesion. Testing of dermatomes is part of the neurological examination. Medial buttock, latera thigh, medial leg, dorsum of foot, big toeīuttock, posterior and lateral thigh, lateral aspect of leg, dorsum of foot, medial half of sole, first, second, and third toes Medial side of upper arm to medial elbow, pectoral and midscapular areasīack, upper buttock, anterior thigh and knee, medial lower leg Medial side of forearm to base of little finger Medial arm and forearm to long, ring, and little fingers Lateral arm and forearm to index, long, and ring fingers Shoulder area, clavicular area, upper scapular areaĭeltoid area, anterior aspect of entire arm to base of thumbĪnterior arm, radial side of hand to thumb and index finger Nerve RootĮntire neck, posterior cheek, temporal area, prolongation forward under mandible The dermatome corresponding with the coccygeal nerves is located on the buttocks, in the area directly around the coccyx. 元 to S1 nerves supply the skin of the legs.T2 to L2 nerves supply the chest and abdomen.
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