When we make faces, we "smile". If facial muscles touch each other and produce depressions, they are "dimples". However, some people call it "Laughing Nest", or it is nicknamed "Pear Nest" because of its different location and size. Not everyone has dimples, but people who have dimples also have different shapes and heights.
Under subdivision, dimples are located about 2-2 on the upper and outer sides of the corners of the mouth. At 7 cm, there are two kinds: round and linear. Generally, the concave hole is the most obvious when making a smile expression. And there is a nest on the face, called pear nest. The pear nest is located below the corner of the mouth, about 1 cm. Pear nests are smaller than dimples, so they are not clear. The formation of dimples is mainly genetic. You can have plastic surgery if you like.
Dimple, also known as smile nest, is a traditional symbol of oriental beauty. Needless to say, the admiration and appreciation of the ancients. Even in the modern age where beautiful women are like clouds, dimple girls are still the object of many people's hearts.
Dimples are divided into three types: round, oval and fissure. Some scholars have investigated, mostly distributed in the cheeks, but also common in the corners of the mouth, zygomatic and chin are relatively few. The occurrence rate of natural dimples in oriental nationalities is 1: 18, with one dimple accounting for 34.2%, two dimples accounting for 59%, three dimples accounting for 5.6% and four dimples accounting for 5.2%. There were/kloc-0 dimples on the left cheek, accounting for 59.6%. Most dimples appeared on the cheek, and most of them were asymmetrical on both sides.
Reasons for formation:
Dimples are formed by muscle activity under the skin. Most muscles of human body are firmly attached to bones through tendon fibers, such as pectoral muscles and lower limb muscles. Facial expression muscles are an exception. It is directly attached to the facial skin. When the expression muscles contract, it will affect the facial skin, so various wrinkles appear on the face, resulting in expressions of joy, anger, sadness and joy. The two dimples on the smiling face are formed by the relative influence of facial skin and facial expression muscles such as buccal muscle and smiling muscle.
Whether there are dimples is related to the development of expression muscles. People with less plump smiling muscles and less subcutaneous fat on their faces generally have no dimples when they smile. In fact, you can also make dimples the day after surgery.
Some people have dimples.
Dominant inheritance means that as long as there is one dominant gene in a pair of genes, certain traits will not be displayed in pairs, such as sharp eyes and double eyelids. In fact, it can also be made by surgery the day after tomorrow.
The most common traits controlled by 10 are: earlobe and earlobe-free; Roll your tongue but not roll it; Hairline has beauty tip and no beauty tip; Thumb can bend to the back, not to the back; The index finger is longer than the ring finger and shorter than the ring finger; When the left and right hands are embedded, the right thumb is on the top and the left thumb is on the top; Double eyelids and single eyelids; With dimples and without dimples; Normal feet and flat feet; Normal color vision and color blindness; Albino and normal skin.