Skin ridges
These ridges are found only on fingers and toes, and on the palms of your hands and soles of your feet. They help to give you a good grip. The skin underneath them is extra thick for added protection.

Fingernails
Nails protect your fingertips (and toenails your toes), and also help you to pick things up. They are made from keratin, the same substance that makes hair. On average, a fingernail grows at a rate of about 1 mm (1/32 in) per week, four times faster than a toenail.

Tag :skin ridges
Tag :fingernails