forefinger

　

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1. 人さし指

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/03/30 23:13:53」(JST)

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Pointer finger
Human hand with index finger extended
Details
Latin	Digitus II manus, digitus secundus manus, index
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
Dorlands /Elsevier	i_06/12448665
TA	A01.1.00.054
FMA	24946
Anatomical terminology

A man pointing at a woman during an argument

The index finger, (also referred to as forefinger, pointer finger, trigger finger, digitus secundus, digitus II, and many other terms), 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.

"Index finger" literally means "pointing finger", from the same Latin source as indicate; its anatomical names are "index finger" and "second digit".

Uses

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. Many between 2 and 12 years of age 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.

Pointing

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.

See also

• Digit ratio
• Extensor indicis proprius
• Fingering
• Index (typography)

References

External links

Media related to Index finger at Wikimedia Commons

• index+finger at eMedicine Dictionary

UpToDate Contents

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English Journal

• Motion representation of the long fingers: a proposal for the definitions of new anatomical frames.

• Coupier J1, Moiseev F2, Feipel V2, Rooze M2, Van Sint Jan S2.
• Journal of biomechanics.J Biomech.2014 Apr 11;47(6):1299-306. doi: 10.1016/j.jbiomech.2014.02.017. Epub 2014 Feb 20.
• Despite the availability of the International Society of Biomechanics (ISB) recommendations for the orientation of anatomical frames, no consensus exists about motion representations related to finger kinematics. This paper proposes novel anatomical frames for motion representation of the phalangeal
• PMID 24612716

• A relapsing macrodactyly.

• Amouyel-Castier M1, Goëb V, Deramond H, Bonnaire B.
• Clinical rheumatology.Clin Rheumatol.2014 Apr 1. [Epub ahead of print]
• Lipofibromatous hamartoma is an uncommon benign tumor, usually unknown or misdiagnosed. We report the case of a 61-year-old patient presenting an acquired painful macrodactyly of the left thumb with paresthesia in the median nerve territory. Clinical examination reveals a tumefaction of the volar si
• PMID 24687379

• Closed loop kinesthetic feedback for postural control rehabilitation.

• Verite F, Bachta W, Morel G.
• IEEE transactions on haptics.IEEE Trans Haptics.2014 Apr-Jun;7(2):150-60. doi: 10.1109/TOH.2013.64.
• Postural control rehabilitation may benefit from the use of smart devices providing biofeedback. This approach consists of increasing the patients perception of their postural state. Namely, postural state is monitored and fed back in real time to the patients through one or more sensory channels. T
• PMID 24968379

Japanese Journal

• 指腹部と物体表面の間の摩擦の測定と発汗の自覚に関する一考察

• 近藤 悟,長谷川 光司,湯山 一郎
• 生体医工学 = Transactions of Japanese Society for Medical and Biological Engineering : 日本エム・イー学会誌 51(2), 149-156, 2013-04
• NAID 40019741503

• タッチパネルタブレット端末におけるディスプレイの表面特性が操作性に及ぼす影響

• 西村 崇宏,土井 幸輝,藤本 浩志
• 日本感性工学会論文誌 12(3), 431-439, 2013
• … We measured the coefficients of kinetic friction between the tip of the forefinger and several screen protection films. …
• NAID 130003378033

• 大網巻絡を伴う腹膜透析カテーテル閉塞に対し下腹部切開示指挿入矯正法を行った1例

• 三井 要造,有地 直子,安食 春輝 [他]
• 西日本泌尿器科 = The Nishinihon journal of urology 74(12), 694-698, 2012-12
• NAID 40019524156

Related Pictures

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★リンクテーブル★

リンク元	「index finger」

「index finger」

　　[★]

同

first finger, forefinger

指

• forefinger
• middle finger
• ring finger
• little finger
• thumb