What are the types of fingerprints?

There are three types of fingerprints:

1. Those with concentric circles or spirals that look like whirlpools in the water are called whorl;

2. Those with lines that are open on one side, i.e., those that look like a dustpan, are called loop;

3. Those with lines that look like a bow are called arch.

In addition to the overall shape of the different, the number of fingerprints, the length of the fingerprints are also different.

Fingerprints, also known as handprints, are the raised lines on the epidermis. Because the human fingerprint is hereditary and environmental **** with the role of the production, so fingerprints everyone has, but different. Because of the fingerprint repetition rate is very small, about 15 billionths, so it is called "human identity card".

Fingerprints are the lines formed by the bumpy skin on the ends of human fingers. Fingerprints increase the friction of the hand when it touches an object, making it easier for the hand to exert force and grip the object, which is a natural part of the human evolutionary process.

Expanded information:

Fingerprints are formed:

During the development of the skin, although the epidermis, dermis, and stroma are all growing at the same time, soft subcutaneous tissue grows more quickly than hard subcutaneous tissue. Subcutaneous tissue grows relatively faster than the hard epidermis, so the epidermis will produce a steady stream of pressure on the top, forcing the slower growing epidermis to the inner layer of tissue contraction and collapse, and gradually become curved wrinkled, in order to alleviate the pressure exerted by the subcutaneous tissue to it.

In this way, on the one hand, to attack, on the one hand, forced to withdraw, resulting in the epidermis grows curved, pitted and uneven, the formation of lines. This process of bending and wrinkling fluctuates and undulates with changes in the upper pressure generated by the inner tissues, forming uneven ridges or folds until the developmental process is halted, and the fingerprints are finalized to the point of death.

Baidu Encyclopedia - Fingerprints