The index finger is located between the thumb and the middle finger, slightly shorter than the ring finger, which is the second most flexible and commonly used finger in human fingers. The word forefinger was recorded earlier than Zuozhuan in the Spring and Autumn Period, from which the idiom "forefinger moves greatly" was derived. It is generally believed that wearing a ring on the left index finger means unmarried. The right index finger means single; Waiting for love.
The index finger is one of the five fingers of the human hand, which is located between the thumb and the middle finger. Is one of the most flexible and commonly used fingers. The index finger consists of three joints, namely, the proximal knuckle, the middle knuckle and the distal knuckle. These joints are composed of bones, muscles, ligaments and nerves, which enable the index finger to grasp, point and touch.
The index finger plays an important role in human daily life. Mainly used for pointing, indicating and touching objects, with strong flexibility and sensitivity. The index finger also participates in various actions, such as pressing keys, clicking and commanding.
Function of index finger
1. Pointing and indicating: The forefinger is the most commonly used finger for pointing, indicating and guiding, which can help us accurately locate and indicate a specific target or direction. For example, when we need to point out an object or place, we often do it with our forefinger.
2. Function control: The index finger has strong flexibility and sensitivity, which enables us to control various functions with it. For example, when operating on the touch screen, we often use the index finger to click and slide to achieve control and operation.
3. Grasping and mastering: As a bridge between hands and fingers, the index finger works with other fingers, which enables us to better grasp and master objects. In daily life, we often use our forefinger and thumb to form a symmetrical grip to complete various tasks and jobs.
4. Fingerprint identification: The fingerprint pattern on everyone's index finger is unique, which makes the index finger an important data source in fingerprint identification technology. Fingerprint identification is widely used in security system, identity verification and criminal investigation.
Baidu Encyclopedia-forefinger