Final answer:
The folds of skin on either side of the nail groove are called the sidewalls. They help to anchor the nail body and provide support.
Step-by-step explanation:
The folds of skin on either side of the nail groove are called the sidewalls. They are part of the nail anatomy that includes several components such as the nail body, the nail fold, and the perionychium. The sidewalls are integral in providing the shape and support for the nail body.
Other terms related to nail anatomy are the nail bed, which is the skin beneath the nail plate and is rich in blood vessels, and the nail cuticle, also known as the eponychium. The nail body is the main keratinous plate that forms the nail and is formed at the nail root, with the help of the nail matrix. The nail matrix contains cells that allow the nail to grow.