Let's see how much you know about fingernails? The arrow points to what part of the fingernail?
4. Nail groove
5. Proximal nailfold
If you answered #1, you would be correct. The lunula is most noticeable on the thumb.
Did you know that nails on your dominant hand grow faster than nails on the nondominant hand? As you age, nails are usually thicker and they grow more slowly. A six month old will grow a new fingernail in 3 months. A 70 year old will take twice as long.
Toenails take 12-18 months to regrow.
Photo and info credit to Medscape