Which part of the nail is most susceptible to injury?

• A. The cuticle
• B. The nail bed
• C. The free edge
• D. The matrix

Answer: (C)

The free edge of the nail is the part that extends beyond the tip of the finger or toe and is most exposed to external factors and potential injury. Because it is not protected by surrounding skin, the free edge can be easily caught on objects, which can result in chipping, breaking, or tearing. This vulnerability increases with activities that involve hands or feet, where the free edge frequently comes into contact with various surfaces.

In contrast, the cuticle serves as a protective barrier, covering the area where the nail meets the skin and shielding the underlying tissues from infection. The nail bed, which is the skin beneath the nail plate, can be injured but is generally protected by the nail above it. The matrix, located at the base of the nail and responsible for nail growth, is also shielded by surrounding tissues and not as exposed as the free edge. Therefore, the free edge has a greater likelihood of experiencing trauma, making it the most susceptible part of the nail to injury.