What does dermatome mean?
A dermatome is a distinct area of skin supplied by the sensory fibers of a single spinal nerve root, so that each band of the body corresponds to a particular segment of the spinal cord. Neurologists use standardized dermatome maps to diagnose nerve injuries: because neighboring territories overlap only slightly, numbness confined to one strip can pinpoint exactly where the nervous system has been damaged. A classic example is shingles, whose rash characteristically breaks out along a single dermatome rather than spreading randomly. In surgery, the word has a second meaning: a dermatome is also the instrument — manual or powered — that slices off thin, even sheets of skin for grafting onto burns or wounds. Both senses derive from Greek roots meaning "skin" and "cut" or "part," making dermatome a precise, technical term valued in medicine for the way it connects a patch of skin to a specific nerve.
An area of skin innervated by sensory fibers from a single spinal nerve root.
"Testing showed diminished pinprick sensation across the L5 dermatome of her right foot."
Usually discussed in relation to dermatome maps used in neurological examination.
A surgical instrument used to cut thin slices of skin, typically for grafting.
"The burn unit's new electric dermatome produced grafts of remarkably uniform thickness."
Regular English plural; commonly used when referring to multiple nerve territories across the body.
"The chart displayed all thirty dermatomes in alternating colors down the length of the body."
Shingles isn't random — its blistering rash traces an exact stripe of skin called a dermatome, drawn on your body by a single spinal nerve.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of dermatome
Dermatome combines the Greek prefix derma- (from derma, "skin") with -tome, from temnein, "to cut." It entered English medical vocabulary in the late nineteenth century alongside other terms built on these roots. The same Greek elements give us epidermis, hypodermic, and taxonomy, all sharing the skin or cutting sense.
How dermatome is actually used
Primarily a technical term used in medicine, especially neurology and surgery. The two senses are distinguished by context: clinical discussions of sensation refer to the skin area, while operating-room contexts usually refer to the cutting instrument. Plural is regular.
Easily confused with dermatome
A dermatologist is a physician who specializes in treating skin conditions, whereas a dermatome is either a defined band of skin served by one spinal nerve or a surgical instrument for slicing skin.