Hand

A hand (med./lat.: manus, pl. manūs) is a prehensile, multi-fingered extremity located at the end of an arm or forelimb of primates such as humans, chimpanzees, monkeys, and lemurs. A few other vertebrates such as the koala (which has two opposable thumbs on each "hand" and fingerprints remarkably similar to human fingerprints) are often described as having either "hands" or "paws" on their front limbs.

Hands are the main structures for physically manipulating the environment, used for both gross motor skills (such as grasping a large object) and fine motor skills (such as picking up a small pebble). The fingertips contain some of the densest areas of nerve endings on the body, are the richest source of tactile feedback, and have the greatest positioning capability of the body; thus the sense of touch is intimately associated with hands. Like other paired organs (eyes, feet, legs), each hand is dominantly controlled by the opposing brain hemisphere, so that handedness, or the preferred hand choice for single-handed activities such as writing with a pencil, reflects individual brain functioning.

Some evolutionary anatomists use the term hand to refer to the appendage of digits on the forelimb more generally — for example, in the context of whether the three digits of the bird hand involved the same homologous loss of two digits as in the dinosaur hand.

The human hand has 27 bones, 14 of which are the phalanges (proximal, medial, and distal) of the fingers. The metacarpal is the bone that connects the fingers and the wrist. Each human hand has 5 metacarpals.

Read more about Hand:  Definitions, Evolution, Additional Images

Other articles related to "hand, hands":

Yixianosaurus
... The specific name means "with a long hand" from Latin longus, "long", and manus, "hand" ... Yixianosaurus has a very long hand, 140% of the length of the 89 millimetres (3.5 in) long humerus ... The large hands could have served in catching prey or assisted climbing ...
Twister (game)
... a square board and is used to determine where the player has to put their hand or foot ... The spinner is divided into four labeled sections right foot, left foot, right hand and left hand ... After spinning, the combination is called (for example "right hand yellow") and players must move their matching hand or foot to a circle of the correct color ...
Invisible Hand - Examples and Arguments
... Since Smith's time, the principle of the invisible hand has been further incorporated into economic theory ... in Human Action (see note 3 at the bottom), claims that Smith believed that the invisible hand was that of God ... The invisible hand is traditionally understood as a concept in economics, but Robert Nozick argues in Anarchy, State and Utopia that substantively the same ...
Invisible Hand - Other Uses of The Phrase By Smith
... Only in The History of Astronomy (written before 1758) Smith speaks of the invisible hand, to which ignorants refer to explain natural phenomena otherwise ... of Nations (1776) Adam Smith speaks of an invisible hand, never of the invisible hand ... They are led by an invisible hand to make nearly the same distribution of the necessaries of life, which would have been made, had the earth been divided into equal portions ...
Invisible Hand - Criticisms - Noam Chomsky
... criticizes how the term of the "invisible hand" has been used ... The invisible hand, he wrote, destroys the possibility of a decent human existence "unless government takes pains to prevent" this outcome, as must be assured in "every improved and ... So as if by an invisible hand England would be spared the ravages of economic rationality ...

Famous quotes containing the word hand:

    No hand has been allowed to touch
    The rose I hide,
    Though eyes have looked upon it and desired it.
    —Unknown. The Thousand and One Nights.

    ErPo. Erotic Poetry; the Lyrics, Ballads, Idyls, and Epics of Love—Classical to Contemporary. William Cole, ed. (1963)

    All the old supports going, gone, this man reaches out a hand to steady himself on a ledge of rough brick that is warm in the sun: his hand feeds him messages of solidity, but his mind messages of destruction, for this breathing substance, made of earth, will be a dance of atoms, he knows it, his intelligence tells him so: there will soon be war, he is in the middle of war, where he stands will be a waste, mounds of rubble, and this solid earthy substance will be a film of dust on ruins.
    Doris Lessing (b. 1919)

    Two well-assorted travellers use
    The highway, Eros and the muse.
    From the twins is nothing hidden,
    To the pair is naught forbidden;
    Hand in hand the comrades go
    Every nook of nature through:
    Each for the other they were born,
    Each can other best adorn.
    Ralph Waldo Emerson (1803–1882)