How does the tail of lizard grow into exactly the same shape?

Not all lizard species are capable of shedding their tails, only those that can have fracture points in their vertebrae. The lizard’s blood vessels in the tail area rapidly constrict after autotomy to ensure minimal blood loss. The muscles in this area are also adapted to provide easy shedding of the tail.

After a lizard drops its tail it will start to grow back a new one, however the new one will not look the same as the original. It may have different colors, shape and size.