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":

Invisible Hand - Other Uses of The Phrase By Smith
... before 1758) Smith speaks of the invisible hand, to which ignorants refer to explain natural phenomena otherwise unexplainable Fire burns, and water ... Wealth 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 ...
Twister (game)
... is attached to a square board and is used to determine where the player has to put their hand or foot ... 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 ...
Invisible Hand - Examples and Arguments
... time, the principle of the invisible hand has been further incorporated into economic theory. 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 concept exists ...
Invisible Hand - Criticisms - Noam Chomsky
... acknowledging the intelligence of Smith's thesis, 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 ... So as if by an invisible hand England would be spared the ravages of economic rationality ...
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 ...

Famous quotes containing the word hand:

    Conventionality is not morality. Self-righteousness is not religion. To attack the first is not to assail the last. To pluck the mask from the face of the Pharisee is not to lift an impious hand to the Crown of Thorns.
    Charlotte Brontë (1816–1855)

    O thou immortal light and heat!
    Whose hand so shines through all this frame,
    That by the beauty of the seat,
    We plainly see who made the same.
    Seeing thy seed abides in me,
    Dwell thou in it, and I in thee.
    Henry Vaughan (1622–1695)

    The hand that signed the treaty bred a fever,
    And famine grew, and locusts came;
    Great is the hand that holds dominion over
    Man by a scribbled name.
    Dylan Thomas (1914–1953)