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The index finger (also referred to as forefinger, [1] first finger, [2] second finger, [3] pointer finger, trigger finger, digitus secundus, digitus II, and many other terms) is the second digit of a human hand. It is located between the thumb and the middle finger. It is usually the most dextrous and sensitive digit of the hand, though not the ...
The first finger is an ambiguous term in the English language due to two competing finger numbering systems that can be used. It might refer to either the thumb or the index finger, depending on the context. Consequently, also the terms second finger, third finger and fourth finger depend on the
The pinky and index fingers are extended but a little more parallel to each other resembling the horns on a demon. Arizona State University Sun Devil fans make a pitchfork sign by extending the index and middle fingers, as well as the pinky. The thumb holds down the ring finger to complete the gesture.
Two-finger salute is a salute made using the middle and index fingers. It is used by Polish Armed Forces and by Cub Scouts. V sign or Victory hand is made by raising the index and middle fingers and separating them to form a V, usually with the palm facing outwards. This sign began to be used during World War II to indicate "V for Victory".
The metacarpal bone of the index finger has two centres of ossification: a primary centre in the shaft and a secondary centre in the head. This contrasts to the first metacarpal bone where the secondary centre is found in the base. The ossification process begins in the shaft during prenatal life, and in the head between 11th and 22nd months. [4]
When a finger touches or rolls onto a surface, the elastic skin deforms. The quantity and direction of the pressure applied by the user, the skin conditions and the projection of an irregular 3D object (the finger) onto a 2D flat plane introduce distortions, noise, and inconsistencies in the captured fingerprint image.
The extensor indicis extends the index finger, and by its continued action assists in extending (dorsiflexion) the wrist and the midcarpal joints. [1]Because the index finger and little finger have separate extensors, these fingers can be moved more independently than the other fingers.
The index finger becomes number 1; the thumb now represents number 5. For numbers above five, the appropriate number of fingers from the other hand are placed against the palm. For example, number 7 is represented by the index and middle finger pressed against the palm of the open hand. [9]