What are the tracks on either side of the nail that the nail moves on as it grows called?

The correct answer identifies the nail grooves as the tracks on either side of the nail that guide its growth. Nail grooves are essentially the small furrows located on either side of the nail plate, within which the nail moves as it grows outwards. These grooves are critical for the proper alignment and growth of the nail, providing a structured pathway that supports the nail's natural progression.

Understanding the role of nail grooves is essential for nail technicians to ensure proper nail care and maintenance. They help to prevent any irregularities in nail growth and can influence the overall aesthetic presentation of the nail.