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The hand is a human organ which is multi-fingered appendage set at the tip of the forearm or limb of primates like humans, chimpanzees, monkeys, and lemurs. A number of alternative vertebrates like the native bear (which has 2 opposable thumbs on every 'hand' and fingerprints extraordinarily like human fingerprints) square measure typically delineate as having 'hands' rather than paws on their front limbs. The raccoon is typically delineated as having 'hands' opposable thumbs square measure lacking.
Some organic process anatomists use the term hand to talk to the appendage of digits on the limb additional usually — as an example, within the context of whether or not the 3 digits of the bird hand concerned the identical homologous loss of 2 digits as within the arch saurian reptile hand.
The human hand unremarkably has 5 digits: four fingers and one thumb; these square measure typically noted conjointly as 5 fingers, however, whereby the thumb is enclosed in a concert of the fingers. Its twenty-seven bones, not as well as the amount of that varies between individuals fourteen of that square measure the phalanges (proximal, intermediate and distal) of the fingers and thumb. The metacarpal bones connect the fingers and therefore the carpal bones of the wrist joint. Every human hand has 5 metacarpals and eight carpal bones.
Fingers contain a number of the densest areas of nerve endings within the body, and square measures the richest supply of tactile feedback. They even have the best positioning capability of the body; so, the sense of bit is intimately related to hands. Like alternative paired organs (eyes, feet, legs) every hand is dominantly controlled by the opposing brain hemisphere, so handedness—the most well-liked hand alternative for single-handed activities like writing with a pencil, reflects individual brain functioning.
Among humans, the hands play a very important operate in visual communication and signing. Likewise the 10 digits of 2 hands, and therefore the twelve phalanges of 4 fingers (touchable by the thumb) have given rise to various systems and calculation techniques.
Image Name: Key In Hand Png
Image category: Hands | Download Hands Zip
Parent category: People
Format: PNG image with alpha (transparent)
License: Creative Commons (CC BY-NC 4.0)
Author: Scott Ward
Date Added: 16-06-2015
PNG Downloads: 471
ICON Downloads: 161
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