同: first finger, forefinger

指

WordNet

provide with an index; "index the book"
a numerical scale used to compare variables with one another or with some reference number
the finger next to the thumb (同)index_finger, forefinger
a number or ratio (a value on a scale of measurement) derived from a series of observed facts; can reveal relative changes as a function of time (同)index_number, indicant, indicator
an alphabetical listing of names and topics along with page numbers where they are discussed
adjust through indexation; "The government indexes wages and prices"
list in an index
search for on the computer; "I fingered my boss and found that he is not logged on in the afternoons"
the length of breadth of a finger used as a linear measure (同)fingerbreadth, finger''s breadth, digit
one of the parts of a glove that provides covering for a finger or thumb
any of the terminal members of the hand (sometimes excepting the thumb); "her fingers were long and thin"
feel or handle with the fingers; "finger the binding of the book" (同)thumb
indicate the fingering for the playing of musical scores for keyboard instruments
the placement of the fingers for playing different notes (or sequences of notes) on a musical instrument
touching something with the fingers
having or resembling a finger or fingers; often used in combination; "the fingered roots of giant trees"; "rosy-fingered"; "three-fingered cartoon characters"
the act of classifying and providing an index in order to make items easier to retrieve

PrepTutorEJDIC

人さし指
(本・雑誌などの)『索引』;図書目録 / 指し示すもの,印 / (計器などの)指針 / 指数・虜 / 《the I-》(カトック教会の)禁所目録 / 〈本など〉‘に'索引をつける / 〈語など〉‘を'索引に載せる
(手の)『指』 / 指の形をしたもの;(手袋の)指;(メーターなどの)指針 / 指幅(びん入りの酒の量を測るときなど) / …‘に'指で触れる,‘を'指でいじる / 〈楽器など〉‘を'指でひく,つまびく
指で触れる(いじる)こと / (弦楽器おひくときの)運指法;運指記号
指状の;指でいじられた / (楽譜が奏法を指示する)指印のついた

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/07/11 11:12:43」(JST)

wiki en

[Wiki en表示]

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.^[1]

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.^[2] However, dogs^[3]^[3] and elephants^[4] do understand finger pointing.

Gestures in Art

As a 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.

Recruitment poster, Alfred Leete, 1914

Recruitment poster, James Montgomery Flagg, 1917

The index finger pointing up is a sign of teaching authority. This is shown in the depiction of Plato in the School of Athens by Raphael.

Plato, detail from the School of Athens, Raphael, 1509

The School of Athens, Raphael, 1509

References

^ Gary Imai. "Gestures: Body Language and Nonverbal Communication" (PDF). Retrieved 12 November 2009. ^{[self-published source?]}^{[dead link]}
^ Day, Nicholas (26 March 2013). "Research on babies and pointing reveals the action’s importance". Slate. Retrieved 25 April 2013.
^ ^a ^b Kirchhofer, Katharina C.; Zimmermann, Felizitas; Kaminski, Juliane; Tomasello, Michael (2012). "Dogs (Canis familiaris), but Not Chimpanzees (Pan troglodytes), Understand Imperative Pointing". PLoS ONE 7 (2): e30913. Bibcode:2012PLoSO...730913K. doi:10.1371/journal.pone.0030913. PMC 3275610. PMID 22347411. Lay summary – Science Daily (February 8, 2012).
^ Goodman, M.; Sterner, K. N.; Islam, M.; Uddin, M.; Sherwood, C. C.; Hof, P. R.; Hou, Z. C.; Lipovich, L.; Jia, H.; Grossman, L. I.; Wildman, D. E. (2009). "Phylogenomic analyses reveal convergent patterns of adaptive evolution in elephant and human ancestries". Proceedings of the National Academy of Sciences 106 (49): 20824–9. Bibcode:2009PNAS..10620824G. doi:10.1073/pnas.0911239106. JSTOR 40536081. PMC 2791620. PMID 19926857. Lay summary – Wired UK (October 10, 2013).

External links

Media related to Index finger at Wikimedia Commons

UpToDate Contents

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Older adults reveal enhanced task-related beta power decreases during a force modulation task.

Hübner L1, Godde B2, Voelcker-Rehage C3.
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Analysis of population structure and genetic diversity in an exotic germplasm collection of Eleusine coracana (L.) Gaertn. using genic-SSR markers.

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Japanese Journal

Validation of normalized pulse volume in the outer ear as a simple measure of sympathetic activity using warm and cold pressor tests: Towards applications in ambulatory monitoring

Lee Jihyoung,Matsumura Kenta,Yamakoshi Takehiro,Rolfe Peter,Tanaka Naoto,Kim Kyungho,Yamakoshi Ken-ichi
Physiological Measurement 34(3), 359-375, 2013-03-00
… Normalized pulse volume (NPV) derived from the ear has the potential to be a practical index for monitoring daily life stress. … Therefore, we compared NPV derived from an index finger using transmission photoplethysmography as a reference, with NPV derived from a middle finger and four sites of the ear using reflection photoplethysmography during baseline and while performing cold and warm water immersion in ten young and six middle-aged subjects. …
NAID 120005253839

高齢者による手指で押す力の調節における日常運動の影響

小島久典,犬丸敏康,宮嶋愛弓 [他]
医学と生物学 156(9), 660-665, 2012-09-00
NAID 40019431046

Paravertebral Arteriovenous Fistula Treated by Endovascular Coil Embolization : Case Report

TERAMOTO Shinichiro,OISHI Hidenori,YOSHIDA Kensaku,YAMAMOTO Munetaka,OHARA Yukoh,ARAI Hajime
Neurologia medico-chirurgica = 神経外科 52(7), 510-512, 2012-07-15
… A 41-year-old man, without underlying health problems or traumatic episodes, presented with a rare paravertebral arteriovenous fistula (AVF) causing radiculopathy manifesting as gradually progressive right grip weakness, and right thumb, index, and middle finger numbness. …
NAID 10030694353

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★リンクテーブル★

リンク元	「第2指」
関連記事	「index」「finger」

「第2指」

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