Dermatomal Zones

Description

Anterior and posterior surfaces of an adult male figure are presented with colored dermatomal zones mapped across the face, trunk, upper limb, and lower limb, reflecting segmental sensory innervation from spinal nerve roots. Cervical territories span the lateral neck and shoulder into the upper extremity, thoracic bands wrap the chest and back in a predictable horizontal sequence, and lumbar and sacral fields cover the anterior thigh, medial leg, lateral foot, and perineal region. Midline boundaries, axial-to-appendicular transitions, and distal gradients along the hand and foot make the nerve distribution patterns clear. Skin sensation, not motor function, is the focus. Dermatome maps matter most when pain or numbness does not follow a single peripheral nerve and you need to localize a lesion to a nerve root. A classic example is distinguishing C6 radiculopathy (thumb and lateral forearm sensory change) from median nerve entrapment at the carpal tunnel (palmar radial digits with thenar sparing patterns that do not respect a single dermatome), or identifying a thoracic radiculopathy that can mimic visceral pain by wrapping around the chest wall. Shingles (herpes zoster) also tracks dermatomes, and the unilateral bandlike rash distribution often points directly to the involved dorsal root ganglion. Localization starts here. Use this artwork in neuroanatomy and clinical neurology teaching, pain medicine references, and exam-prep materials that cover sensory testing, radiculopathy patterns, and spinal root levels. It also fits patient-facing education for sciatica versus peripheral neuropathy and for explaining zoster rash distribution in primary care or dermatology clinics. Anatomical accuracy verified by SciePro's Medical Advisory Board.