Index finger

The index finger also known as first finger, pointer finger, forefinger, or digitus secundus is the second digit of a human hand. It is located between the thumb and the middle finger. It is typically the most dexterous and sensitive finger of the hand, though not the longest – it is shorter than the middle finger, and may be shorter or longer than the ring finger – see digit ratio.

Anatomy

The index finger has three phalanges. The distal phalanx is at the tip, the middle phalanx is in the mid-section, and the proximal phalanx meets the hand at the knuckle. The thumb also has a proximal phalanx, but it is not distinct in humans and is often considered part of the thumb itself.

Function

The index finger is the most commonly used finger in many cultures. It is used to point and press buttons, and is often used in gestures of indication or assertion. In many cultures, it is also used to represent the number 1.

Cultural Significance

In many cultures, the index finger is used in a number of symbolic gestures, such as pointing or indicating direction. It is also commonly used in non-verbal communication to indicate agreement or to draw attention.

Health and Medicine

The index finger, like all fingers, can be affected by a variety of medical conditions, including arthritis, fracture, and tendonitis. It is also a common site for cuts and burns.

See Also

• Finger
• Hand
• Human anatomy
• Digit ratio

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