A segment of skin or body wall tissue that develops from a single embryonic somite, corresponding to a spinal nerve distribution.
From Greek 'derma' (skin) and 'mere' (part or segment), influenced by biological terminology. This term emerged from embryology to describe how skin segments develop and relate to the nervous system organization.
Your skin is literally segmented like a map based on embryonic development—this is why dermatomes follow predictable patterns and shingles (herpes zoster) causes pain and rash in a band following a single nerve's distribution, revealing this hidden segmental architecture.
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