1 the (prehensile) extremity of the superior limb; "he had the hands of a surgeon"; "he extended his mitt" [syn: manus, mitt, paw]
2 a hired laborer on a farm or ranch; "the hired hand fixed the railing"; "a ranch hand" [syn: hired hand, hired man]
3 something written by hand; "she recognized his handwriting"; "his hand was illegible" [syn: handwriting, script]
4 ability; "he wanted to try his hand at singing"
5 a position given by its location to the side of an object; "objections were voiced on every hand"
6 the cards held in a card game by a given player at any given time; "I didn't hold a good hand all evening"; "he kept trying to see my hand" [syn: deal]
7 one of two sides of an issue; "on the one hand..., but on the other hand..."
8 a rotating pointer on the face of a timepiece; "the big hand counts the minutes"
9 a unit of length equal to 4 inches; used in measuring horses; "the horse stood 20 hands"
10 a member of the crew of a ship; "all hands on deck"
11 a card player in a game of bridge; "we need a 4th hand for bridge" [syn: bridge player]
12 a round of applause to signify approval; "give the little lady a great big hand"
13 terminal part of the forelimb in certain vertebrates (e.g. apes or kangaroos); "the kangaroo's forearms seem undeveloped but the powerful five-fingered hands are skilled at feinting and clouting"- Springfield (Mass.) Union
14 physical assistance; "give me a hand with the chores" [syn: helping hand]
1 place into the hands or custody of; "hand me the spoon, please"; "Turn the files over to me, please"; "He turned over the prisoner to his lawyers" [syn: pass, reach, pass on, turn over, give]
2 guide or conduct or usher somewhere; "hand the elderly lady into the taxi"
- /hænd/, /h}
The hands (med./lat.: manus, pl. manūs) are the two intricate, prehensile, multi-fingered body parts normally located at the end of each arm of a human or other primate. They are the chief organs for physically manipulating the environment, using anywhere from the roughest motor skills (wielding a club) to the finest (threading a needle), and since the fingertips contain some of the densest areas of nerve endings on the human body, they are also the richest source of tactile feedback so that sense of touch is intimately associated with human hands. Like other paired organs (eyes, ears, legs), each hand is dominantly controlled by the opposing brain hemisphere, and thus handedness, or preferred hand choice for single-handed activities such as writing with a pen, reflects a significant individual trait.
What constitutes a hand?Many mammals and other animals have grasping appendages similar in form to a hand such as paws, claws, and talons, but these are not scientifically considered to be hands. The scientific use of the term hand to distinguish the terminations of the front paws from the hind ones is an example of anthropomorphism. The only true hands appear in the mammalian order of primates. Hands must also have opposable thumbs, as described later in the text.
Humans have only two hands (except in cases of polymelia), which are attached to the arms. Apes and monkeys are sometimes described as having four hands, because the toes are long and the hallux is opposable and looks more like a thumb, thus enabling the feet to be used as hands. Also, some apes have toes that are longer than human fingershttp://www.ufovideo.net/BIGFOOTxSASQUATCHxHandsxFeetxlarge.jpg.
Anatomy of the human handThe human hand consists of a broad palm (metacarpus) with 5 digits, attached to the forearm by a joint called the wrist (carpus). The back of the hand is formally called the dorsum of the hand.
DigitsThe four fingers on the hand are used for the outermost performance; these four digits can be folded over the palm which allows the grasping of objects. Each finger, starting with the one closest to the thumb, has a colloquial name to distinguish it from the others:
The thumb (connected to the trapezium) is located on one of the sides, parallel to the arm. The thumb can be easily rotated 90°, on a level perpendicular to the palm, unlike the other fingers which can only be rotated approximately 45°. A reliable way of identifying true hands is from the presence of opposable thumbs. Opposable thumbs are identified by the ability to be brought opposite to the fingers, a muscle action known as opposition.
BonesThe human hand has 27 bones: the carpus or wrist account for 8; the metacarpus or palm contains 5; the remaining 14 are digital bones, your fingers and thumb. The eight bones of the wrist are arranged in two rows of four. These bones fit into a shallow socket formed by the bones of the forearm. The bones of proximal row are (from lateral to medial): scaphoid, lunate, triquetral and pisiform.
The bones of the distal row are (from lateral to medial): trapezium, trapezoid, capitate and hamate. The palm has 5 bones (metacarpals), one to each of the 5 digits. These metacarpals have a head and a shaft.
Human hands contain 14 digital bones, also called phalanx bones: 2 in the thumb (the thumb has no middle phalanx) and 3 in each of the four fingers. These are:
- the distal phalanx, carrying the nail,
- the middle phalanx and
- the proximal phalanx.
Sesamoid bones are small ossified nodes embedded in the tendons to provide extra leverage and reduce pressure on the underlying tissue. Many exist around the palm at the bases of the digits; the exact number varies between different people.
ArticulationsAlso of note is that the articulation of the human hand is more complex and delicate than that of comparable organs in any other animals. Without this extra articulation, we would not be able to operate a wide variety of tools and devices. The hand can also form a fist, for example in combat, or as a gesture.
The articulations are:
Muscles and tendonsThe movements of the human hand are accomplished by two sets of each of these tissues. They can be subdivided into two groups: the extrinsic and intrinsic muscle groups. The extrinsic muscle groups are the long flexors and extensors. They are called extrinsic because the muscle belly is located on the forearm.
The intrinsic muscle groups are the thenar and hypothenar muscles (thenar referring to the thumb, hypothenar to the small finger), the interosseus muscles (between the metacarpal bones, four dorsally and three volarly) and the lumbrical muscles. These muscles arise from the deep flexor (and are special because they have no bony origin) and insert on the dorsal extensor hood mechanism.
The fingers have two long flexors, located on the underside of the forearm. They insert by tendons to the phalanges of the fingers. The deep flexor attaches to the distal phalanx, and the superficial flexor attaches to the middle phalanx. The flexors allow for the actual bending of the fingers. The thumb has one long flexor and a short flexor in the thenar muscle group. The human thumb also has other muscles in the thenar group (opponens- and abductor muscle), moving the thumb in opposition, making grasping possible.
The extensors are located on the back of the forearm and are connected in a more complex way than the flexors to the dorsum of the fingers. The tendons unite with the interosseous and lumbrical muscles to form the extensorhood mechanism. The primary function of the extensors is to straighten out the digits. The thumb has two extensors in the forearm; the tendons of these form the anatomical snuff box. Also, the index finger and the little finger have an extra extensor, used for instance for pointing. The extensors are situated within 6 separate compartments. The 1st compartment contains abductor pollicis longus and extensor pollicis brevis. The 2nd compartment contains extensors carpi radialis longus and brevis. The 3rd compartment contains extensor pollicis longus. The extensor digitorum indicis and extensor digititorum communis are within the 4th compartment. Extensor digiti minimi is in the fifth, and extensor carpi ulnaris is in the 6th.
VariationSome people have more than the usual number of fingers or toes, a condition called polydactyly. Others may have more than the typical number of metacarpal bones, a condition often caused by genetic disorders like Catel-Manzke syndrome. The average length of an adult male hand is 189 mm, while the average length of an adult female hand is 172 mm. The average hand breadth for adult males and females is 84 and 74 mm respectively.
External linksportalpar Biology
hand in Arabic: يد
hand in Aragonese: Man
hand in Aymara: Ampara
hand in Official Aramaic (700-300 BCE): ܐܝܕܐ
hand in Catalan: Mà
hand in Czech: Ruka
hand in Welsh: Llaw
hand in Danish: Hånd
hand in German: Hand
hand in Spanish: Mano
hand in Esperanto: Mano
hand in Persian: دست
hand in French: Main
hand in Korean: 손
hand in Ido: Manuo
hand in Indonesian: Tangan
hand in Italian: Mano
hand in Hebrew: כף יד
hand in Latin: Manus
hand in Malayalam: കൈപ്പത്തി
hand in Dutch: Hand
hand in Cree: ᒥᑎᐦᒌ
hand in Japanese: 手
hand in Narom: Main
hand in Polish: Dłoń
hand in Portuguese: Mão
hand in Quechua: Maki
hand in Russian: Рука
hand in Simple English: Hand
hand in Slovak: Články prstov
hand in Slovenian: Roka
hand in Finnish: Käsi
hand in Swedish: Hand
hand in Thai: มือ
hand in Turkish: El
hand in Ukrainian: Кисть
hand in Yiddish: האנט
hand in Chinese: 手
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