The hand length is the midpoint of the connecting line between the styloid process point of radius and the styloid process point of ulna, which roughly corresponds to the linear distance between the midpoint of wrist skin flexion curve and the fingertip point of middle finger. The average hand length is 18 or 19, which can be the vertical distance from the first horizontal stripe inside the wrist to the longest fingertip.

The hand is a part of the front end of the arm of a human or other primate. It consists of five fingers and palms, and is mainly used to hold things. Both hands are symmetrical and mirror images of each other.

Most people have a left hand and a right hand, except for deformity or hyperplasia at birth. Each hand has five fingers, including the index finger, middle finger, ring finger, little finger (also called tail finger) and only two thumbs, but it is also possible to have a sixth finger at birth. There are nails at the tips of the five fingers, each with its own length, which is longer than the palm end.

Judging whether your hand is big or small can be judged by measuring the length from the palm root to the middle finger. Generally, a palm whose length from the palm root to the middle finger is less than 17 cm, a palm between 17cm and 19 cm is a middle finger, and a palm over 19cm is a big hand. The hand is one of the most distinctive organs of the human body, which is mainly used for grasping and taking things. It can play different roles through different movements and activities of the hand.

Characteristics of the hand:

The five fingers can bend inward and swing slightly from side to side. Bending fingers can make different gestures, including five-finger fist-making, V-shaped gesture of raising index finger and middle finger, indecent gesture of raising middle finger and so on. When some fingers stand up, it may be difficult for the left and right fingers to bend by themselves. For example, when other fingers are bent, the ring finger cannot be completely vertical, or when other fingers are vertical, the little finger may not be completely bent, but these situations can be achieved through continuous practice, relaxing finger muscles and training finger nerves.