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The Human Hand Essay

528 words - 3 pages

Touch some would say touching is our most useful and valuable sense given to us by evolution. Touching is our primary sense we use to interact with our tangible environment. The organ most attributed to touch is or hands, have you ever wondered how it would feel to lose a hand or even a finger, the human hand is a complex array of nerves, muscles, and bones all of these features combine to give us our primary physical organ.The fingers of our hands have are the most useful feature and the ones we use most. The first finger of the hand is the Index finger it is usually the most agile finger as it sees the most use. The second finger of the hand is ...view middle of the document...

The fingers can grip, grab, and hold things for our use; the fingers have a huge list of uses from specialist to everyday.The bones of the human hand are comprised into 3 main sections. The bones of the wrist, palm, and fingers. The eight bones of the palm (metacarpus) consist of five bones and has a oblong shape. Phalanx bones form the fingers and are in turn divided into 3 sections with a knuckle between for articulation. These three sections allow us to grip and hold things with our hands. The bones of the wrist are the most solid, set into a two by four row. The proximal row holds the scaphiod, lunate, and pisiform bones, followed by the distal row which holds the trapezium, trapezoid, and hamate bones.Finally the glue of the hand its muscles, the muscles of the hand flex and contract to give us precision and brute force when needed they are divided into two main groups intrinsic and extrinsic muscles. The intrinsic muscles control the "backwards" movement of the fingers and are located in between the palm bones.The extrinsic muscles are the opposite of the intrinsic muscles as the originate from the forearm and snake up towards the fingertips. The intrinsic muscles control the bending and squeezing of the fingers and are responsible for the lateral movement also.The human hand is an invaluable tool in everyday activities with its huge range of articulation, precision, and strength. The infinite uses of the hand and its association with our sense of touch make it one of the most complex organs of our anatomy.

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