What is the medical term for ridges in the nails that run vertically?

The medical term for ridges in the nails that run vertically is known as longitudinal striations. These are typically slender, linear patterns that extend from the cuticle to the tip of the nail. Longitudinal striations can be associated with various factors, including aging, nutritional deficiencies, or underlying health conditions. Understanding this term is crucial for nail technicians as it helps in identifying potential health issues based on the appearance of a client's nails. The focus on vertical rather than horizontal patterns differentiates longitudinal striations from other types of markings, leading to better assessments and care recommendations for nail health.