|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|
|Latin||Digitus II manus, digitus secundus manus, index|
The index finger (also referred to as forefinger,first finger,pointer finger, trigger finger, digitus secundus, digitus II, and many other terms) is the second finger 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.
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.
Pointing with index finger may be used to indicate an item or person.
Around the age of one year, babies begin pointing to communicate relatively complex thoughts, including interest, desire, information, and more. Pointing in human babies can demonstrate the theory of mind, or ability to understand what other people are thinking. This gesture may form one basis for the development of human language. Non-human primates, lacking the ability to formulate ideas about what others are thinking, use pointing in much less complex ways. However, dogs and elephants do understand finger pointing.
In the Netherlands sticking up your index finger with your palm faced towards someone is a greeting.
In Arabic, the index or fore finger is called musabbi?a (), mostly used with the definite article: al-musabbi?a (). Sometimes also as-sabba (?) is used.The Arabic verb ? - which shares the same root as the Arabic word for index finger - means to praise or glorify God by saying: "Subna All?h" ( ?).
The Romans used the forefinger while fighting because the index finger asserted that the enemy was in front of them.
As an artistic convention, the index finger pointing at the viewer is in the form of a command or summons. Two famous examples of this are recruiting posters used during World War I by the United Kingdom and the United States.
Media related to Index fingers at Wikimedia Commons