Index finger | |
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Details | |
Artery |
Radial artery of index finger, proper palmar digital arteries, dorsal digital arteries |
Vein | Palmar digital veins, dorsal digital veins |
Nerve | Dorsal digital nerves of radial nerve, proper palmar digital nerves of median nerve |
Identifiers | |
Latin | Digitus II manus, digitus secundus manus, |
TA | A01.1.00.054 |
FMA | 24946 |
Anatomical terminology
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The index finger, (also referred to as forefinger, pointer finger, trigger finger, digitus secundus, digitus II, and ), is the first finger and the second digit of a human hand. It is located between the first and third digits, between the thumb and the middle finger. It is usually the most dextrous 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.
"" literally means "pointing finger", from the same Latin source as ; its anatomical names are "index finger" and "second digit".
A lone index finger held vertically is often used to represent the number 1 (but finger counting differs across cultures), or when held up or moved side to side (finger-wagging), it can be an admonitory gesture. With the hand held palm out and the thumb and middle fingers touching, it represents the letter d in the American Sign Language alphabet. In sports, it can also represent victory, as some championship-winning teams raise their index finger (often saying "We're number one!") while posing for a championship team photo – oversized foam hands with a single upraised index are also used for this purpose; compare with the victory sign. Most humans find the index finger particularly useful for "picking" their nose. This is done when the index finger is thrust upward into the nasal passage. For the vast majority of computer users, it is the finger most often used to (left) click a mouse, as well as the finger used in the untrained 'hunt and peck' typing style.