There are two hearts on the head. What's the scientific name? And fingerprints. What are their names?

Spin is also called top, one horizontal top is better than three. This is a traditional saying, don't take it seriously. A person's character depends on cultivation.

The hair shaft inclines to the skin. Many hairs are inclined in the same direction, which is called hairflow or hairflow. The flow of hair on the top of the head can form a spiral arrangement of the center outward and the surrounding hair, commonly known as hair spinning.

Usually people have a hair spin, mostly located on the top of the head, or left and right. A few people have two or three hairpins, some of which are located at the front of the head, forming a special hair stream. The position of the hair spin has a certain influence on the hairstyle. It is difficult for people with many hairstyles to comb and do their hair styles. Therefore, understanding and mastering the growth law of hairflow is conducive to better hair design.

The shape of hair varies from race to race. Yellow hair is straight, cylindrical and thick, and the cross section is round and yellow; The shape of white hair varies greatly, which can be straight or wavy. The cross section is oval and the color is black, golden yellow or white. Black capillary and curly, oval in cross section, but flat on one side, its fur and skin are obviously distorted and easily damaged by external factors.

The straightness of hair is related to the shape of hair follicles. Hair follicles are cylindrical, and the hair that grows out is straight; Hair follicles are oval or oval in shape, and the hair they grow is wavy or curly. The irregular growth of hair balls is also related to the formation of curly hair.

There are some sayings about numbers among the people, but they are not completely correct.

It is logically related: otherwise, why are all people the same, and only a few people are special? It shows that the physiological characteristics of these few people are different from those of most people, and their physiological factors such as metabolism and blood circulation are also different from those of most people. Therefore, this will certainly have an impact on his character. But the day after tomorrow, most of them lived for a long time and gradually assimilated with it, and the difference was not obvious. Of course, there are still a few. This is the reason why fortune tellers talk nonsense about this problem.

Fingerprint is a line formed by the concave and convex skin on a person's fingertip. Fingerprint can increase the friction when the hand touches the object, so it is easier to exert force and grasp the object. It is naturally formed in the process of human evolution.

Fingerprints are genetically influenced. Because everyone's genes are different, so are their fingerprints. However, although the formation of fingerprints is mainly influenced by heredity, there are also environmental factors. When the fetus develops in the mother's body for three to four months, the fingerprint has been formed, but the child's fingerprint will change slightly in the process of growth, and it will not be finalized until puberty is about 14 years old. In the process of skin development, although the epidermis, dermis and matrix layer all grow together, the soft subcutaneous tissue grows faster than the relatively hard epidermis, so it will generate a continuous jacking pressure on the epidermis, forcing the slow-growing epidermis to contract and collapse towards the internal tissue, and gradually bend and wrinkle, so as to reduce the pressure exerted by the subcutaneous tissue. On the one hand, it is hard to attack, on the other hand, it is forced to withdraw, which leads to uneven skin and lines. This process of bending and wrinkling fluctuates with the change of the upward pressure generated by the internal tissue, forming uneven ridges or wrinkles until the development process stops, and finally it is shaped into a fingerprint that will remain unchanged until death.

There are three basic types of fingerprints-ring, bow and spiral. It is the different directions of subcutaneous tissue pressing the epidermis of finger pulp that create these different types. Studies have shown that if someone's finger belly is tall and round, the fingerprint will be spiral. Now, scientists have been able to reproduce those common fingerprints through models, and they can also repeat the formation process of less complicated rare fingerprints.