How to observe the health status of internal organs from the appearance of human body

Symmetry can give people the aesthetic feeling of perfect symmetry. The "three elements" of beauty are simplicity, symmetry and harmony. The symmetrical human body coincides with Huang Jinlv. From the appearance, the complex human body is so simple, while the simple human body is symmetrical everywhere. Do you think human body is beautiful? It is said that the word "symmetry" first appeared in the 5th century BC. Poliklitos, a famous sculptor in ancient Greece, put forward the ideal proportional relationship in sculpture in a book. Nature shows image symmetry everywhere, like human body, even birds, animals, fish and insects, which are mostly left-right symmetry. People's eyes, ears, hands and feet are lifelike, and the left and right halves are very symmetrical. In addition to left-right symmetry, there are so-called "axial symmetry" and "central symmetry". The navel is called the "golden section" of the human body surface and is an important body surface symbol. Without this sign, it would be much more difficult to divide the human body into two symmetrical halves. However, the human body is also a complex geometric figure, with points, lines, faces, triangles, circles and so on. In the details of the human body, it is not absolutely symmetrical. For example, some faces are half big and half small; Some people have big eyes and a small amount; Someone's eyebrows, one high and one low, one flat and one upturned; Some people's ears, one big and one small, one pointed and one round. Although some people look well-proportioned, careful observation can still reveal some asymmetries. Therefore, this asymmetry of the human body is everywhere and ever-changing. In fact, this is not only the appearance from head to toe, but also from outside to inside, from static to dynamic. Look at the head and face first. The development of the left and right sides of the head and face is mostly inconsistent. If you take an arbitrary face photo, divide it into left and right halves according to the center line, and then restore it according to the left and right halves respectively, you can get two completely different portraits. In the head-face asymmetry, some people are more developed on the left side, while others are more developed on the right side. Although there is little difference between the two sides, they are different after all. Some people abroad have investigated that the external ear, eyes and nasolabial groove on the left side (that is, two deep wrinkles diagonally above the mouth on both sides) are relatively developed; On the right, there are more developed faces and nostrils. Because the right face is often larger than the left face, the midline of a person's face tends to tilt to the left, and the tip of his nose tends to tilt to the left. Similarly, the corners of the mouth are often high on the right and low on the right. In addition, about 80% of the hair on the top of the head rotates clockwise to the right. Look at the trunk and limbs. The spine bends to the right in the chest; At the waist, it often bends to the left. Then, the left shoulder tends to be higher and seems wider. According to the measurement, only 18% of human upper limbs have the same length on both sides. Most people (75%) have longer right side than left side; On the other hand, the remaining 7% is shorter on the right side than on the left. The same is true for the measurement of bones: the diameter of the right bone is larger and thicker than that of the left bone. The lower limbs are similar to the upper limbs, and the right side is often slightly larger than the left side in terms of length, weight and volume. But the difference between the two lower limbs is not as obvious as that of the upper limbs. About 52% people have the dominant right lower limb; 15% of people have the dominant left lower limb; Both sides are equal, accounting for 33%. As for the muscles of the trunk and upper and lower limbs, they are generally developed on the right side. The phenomenon of left-right asymmetry is also common in human internal organs, and it is more obvious. Anatomists have long pointed out that people are eccentric. Two-thirds of the heart is on the left side of the median plane of the body, and 1/3 is on the right side; The right lung is divided into upper, middle and lower lobes, and the left lung is divided into upper and lower lobes. Right lung is wider and shorter than left lung, and right lung is heavier than left lung. The weight ratio of right lung to left lung is 10: 9 in males and 8: 7 in females. Most of the liver and gallbladder are on the right side of the body; The pancreas and spleen are mostly on the left side; When the stomach is moderately full, most of it is located on the left side of the body. The upper edge of the stomach is short, which is called gastric minor curvature, and it is depressed to the upper right; The lower edge of the stomach is long, which is called gastric curvature and protrudes to the lower left; Two kidneys, the left kidney is slender, the right kidney is short and wide, and the left kidney is heavier, slightly higher than the right kidney tip; The left and right hemispheres are not completely symmetrical. The frontal lobe is in the anterior upper part of the cerebral hemisphere, and the right side is slightly larger than the left side; The left side of the lower occipital lobe is slightly larger than the right side. In addition, the left side of the male testis is often slightly larger than the right side, and its position in the scrotum is lower, about 1 cm. Since there is asymmetry in the shape and internal structure of the human body, there is also asymmetry in the corresponding functions, and the most obvious example is the hand. Most people are right-handed and are used to using their right hands in daily life. A few people are left-handed (commonly known as left-handed) and mixed-race. Similarly, the asymmetry of lower limb function also has many manifestations. For example, most people are used to kicking the ball with their right foot and taking the first step with their left foot; When crossing your legs, you often use your left leg as the pillar; When two legs stand quietly, one knee joint is always overstretched as a support leg, the other side is slightly flexed as a support, and then rotated and exchanged, which is called asymmetric standing. For another example, most people like to look at objects with a magnifying glass or microscope, or through small holes or gaps. It can be seen that the functions of the two hemispheres of the human brain are also asymmetric, and the left side is often dominant, which is called the dominant hemisphere. Studying these asymmetric phenomena is of great value to medicine, art and anthropology. Only by studying the asymmetry of normal people can we show the abnormal asymmetry of human body: which are congenital variation or deformity; What is an acquired lesion? This will be of great help to clinical medical diagnosis. Like some people's mouths obviously tilt to the left, this is