What term describes distribution of symptoms distributed along nerve root segments?

• A. Dermatomal distribution
• B. Radicular distribution
• C. Segmental distribution
• D. Diffuse distribution

Answer: (A)

Symptoms that trace a skin map supplied by a single spinal nerve root are described as a dermatomal distribution. Dermatomes are the skin areas innervated by one dorsal root, so when sensory changes or pain follow these band-like skin regions, it points to nerve-root–level involvement. This makes dermatomal distribution the most precise way to describe distribution along nerve root segments.

Radicular distribution emphasizes pain radiating along a nerve root, which is related but focuses on the pain pathway rather than the specific skin territory; segmental distribution is broader and less specific to cutaneous nerve roots; diffuse distribution implies widespread involvement rather than a localized, root-related pattern.