arm

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arm,

upper limb in humans. Three long bones form the framework of the arm: the humerus of the upper arm, and the radius (outer bone) and ulna (inner bone) of the forearm. The radius and ulna run parallel but meet at their ends in such a manner that the radius can rotate around the ulna. This arrangement permits turning the forearm to bring the hand palm up (supination) or palm down (pronation). The radius and ulna hinge with the bones of the hand at the wrist, and with the humerus at the elbow. The bicepsbiceps
, any muscle having two heads, or fixed ends of attachment, notably the biceps brachii at the front of the upper arm and the biceps femoris in the thigh. Originating in the shoulder area, the heads of the biceps merge partway down the arm to form a rounded mass of tissue
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 brachii, a muscle of the upper arm, bends the arm at the elbow; the tricepstriceps,
any muscle having three heads, or points of attachment, but especially the triceps brachii at the back of the upper arm. One head originates on the shoulder blade and two on the upper-arm bone, or humerus.
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 brachii straightens the arm. Movement of the arm across the chest and above the head is accomplished by the pectoral muscles of the chest and deltoid muscles of the shoulder, respectively. In an adult the arm is normally five sixths as long as the leg.

Arm

 

the upper extremity in man consisting of the shoulder, forearm, and hand (carpus, metacarpus, and phalanges of the fingers). The arm is a more developed grasping extremity in man than in man’s ancient ancestors, the Anthropomorphidae.

The transformation from Anthropomorphidae to man was largely promoted by freeing the anterior extremities, or arms, from locomotion and body-support functions and converting them into organs capable of performing work operations. As the arm became adapted to work, its structure substantially changed, becoming sharply distinct from the structure of the anterior extremity of Anthropomorphidae.

The most significant structural changes occurred in the hand. In Anthropomorphidae the hand has an underdeveloped thumb and the remaining fingers are greatly elongated; in contrast, the human hand is characterized by a powerfully developed thumb that is essential in performing all work operations. The remaining fingers of the human hand are significantly shorter than those of Anthropoidea but are nevertheless capable of the most delicate and differentiated movements.

In man’s development, the development of the arm as a work organ occurred simultaneously with the progressive development of the brain.

The body processes in brachiopods, the tentacles in cephalopods, and the mobile or nonmobile rays of echinoderms are sometimes called arms.

arm

[ärm]
(anatomy)
The upper or superior limb in humans which comprises the upper arm with one bone and the forearm with two bones.
(control systems)
A robot component consiting of an interconnected set of links and powered joints that move and support the wrist socket and end effector.
(electricity)
(engineering acoustics)
(geology)
A ridge or a spur that extends from a mountain.
(mathematics)
A side of an angle.
(naval architecture)
The part of an anchor extending from the crown to one of the flukes.
(oceanography)
A long, narrow inlet of water extending from another body of water.
(ordnance)
A combat branch of a military force; specifically, a branch of the U.S. Army, such as the Infantry Armored Cavalry, the primary function of which is combat.
(Often plural) Weapons for use in war.
To supply with arms.
To ready ammunition for detonation, as by removal of safety devices or alignment of the explosive elements in the explosive train of the fuse.
(physics)
The perpendicular distance from the line along which a force is applied to a reference point.

ARM

(processor)
Advanced RISC Machine.

Originally Acorn RISC Machine.

ARM

(company)
Advanced RISC Machines Ltd.

ARM

(publication)
["The Annotated C++ Reference Manual", Margaret A. Ellis and Bjarne Stroustrup, Addison-Wesley, 1990].

ARM

(hardware)
References in periodicals archive ?
Because bobbies are not just the long arm of the law, but also the safest pair of hands.
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Under current law, reporters' ability to shield sources from the long arm of the law is not a federal right for all Americans but a privilege granted in 31 states and the District of Columbia to the limited category of human being known as "journalist" And by wearing the First Amendment like a badge, Bronstein is neatly evading his role in helping the government eviscerate another part of the Bill of Rights.
Granting the flaws in his sampling techniques, symptoms of the social science at the time rather than of any secret agenda, the broad conclusions Kinsey drew from his data have held up--and it's those conclusions that ultimately changed the way a nation talked about sex and subsequently kicked the long arm of the law out of the American bedroom: Homosexuality, premarital sex, and extramarital sex were all more common than previously acknowledged.
Other courses were warned; an alert booking clerk at another track spotted the same trick being staged, and the long arm of the law was on hand to surprise at least one of the perpetrators.
With our federal partners, the long arm of the law has gotten very long.
But in the week the staff donned the garb of the long arm of the law, not one incident was recorded.
In its heyday, Napster was the vehicle for millions of song swaps and, by all reports, was still growing when the long arm of the law slid its mouse across the URL and clicked it closed.
As it becomes routine for law enforcement to obtain latent prints from skin, murderers who reach out to harm their victims will just be putting themselves within easy reach of the long arm of the law.
A new white paper issued by technology expert Joel Shore discusses the long arm of the law with computers and how Undelete(R) software can solve your legal woes.
The media coverage will help stretch the long arm of the law.
Summary: The long arm of the law is still catching up with the bachelors in Dubai who live in residential areas.