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.
Other articles related to "hand, hands":
... before 1758) Smith speaks of the invisible hand, to which ignorants refer to explain natural phenomena otherwise unexplainable Fire burns, and water refreshes heavy bodies descend, and lighter substances fly ... 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 ...
... Since Smith's time, the principle of the invisible hand has been further incorporated into economic theory ... 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 concept exists in a ...
... is attached to 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 ...
... 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 ... So as if by an invisible hand England would be spared the ravages of economic rationality ...
... 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:
“That big gun in your hand makes you look grown upyou think! Ill bet you spend hours posing in front of a mirror holding it, trying to look tough!... You scum!”
—Richard Brooks (19121992)
“Whoso taketh in hand to frame any state or government ought to presuppose that all men are evil, and at occasions will show themselves so to be.”
—Sir Walter Raleigh (15521618)
“Just as the hand that strikes the ground cannot fail,
So is the ruin certain of him who cherishes anger.”
—Tiruvalluvar (c. 5th century A.D.)