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)

ARM

The most widely used microprocessors worldwide. Designed by ARM Holdings plc, Cambridge, England (www.arm.com), the company was founded in 1990 by Acorn Computers, Apple and VLSI Technology. In 2016, ARM was acquired by Japan-based Softbank. The ARM brand originally stood for Acorn RISC Machine and later Advanced RISC Machine.

ARM chips are 32-bit and 64-bit RISC-based CPUs that are known for their low cost and low power requirements (see RISC). Manufactured under license from ARM by more than a dozen semiconductor companies, billions of ARM-based devices are made every year, including smartphones, tablets, game consoles, e-book readers, netbooks, TVs and myriad other consumer and industrial products.

Very often, an ARM CPU is the processor in a system-on-chip (see SoC). For example, Qualcomm's Snapdragon and NVIDIA's Tegra are ARM-based smartphone and tablet SoCs.

Cortex, SecurCore and StrongARM
ARM processor families are designated by the prefix "ARM" and a digit, such as ARM7, ARM9 and ARM11 or with names such as Cortex and SecurCore, the latter used for secure identification products such as smart cards.

The StrongARM was a high-speed version of the ARM chip that was jointly developed with Digital Equipment Corporation. The SA-100, the first StrongARM chip, was delivered in 1995, and Intel acquired the technology from Digital in 1997. See StrongARM, Thumb and big.LITTLE.
References in periodicals archive ?
The AFRH has a long and distinguished tradition of excellence in serving the veterans of the Armed Forces, and we will strive to continue that tradition in the coming years.
Armed criminals do the same in encounters with law enforcement professionals to ensure concealment and easy access to their firearms.
Basic principles of safely stopping suspected armed individuals should include some primary considerations.
In Angola, he has armed both sides of the fighting in a two-decades -long civil war, though he has favored the rebel group known as UNITA, which is under a blanket U.N.
The leadership of preexisting far-right groups, such as the Posse Comitatus, the Aryan Nations, and the Christian Patriots are attempting to steer the armed militia movement toward these white-supremacist and racist ideologies.
Hunter is a book about parasitic Jews destroying America, and the need for armed civilians to carry out political assassinations to preserve the white race.
The JANUS software is designed for more conventional military operations and was intended for training the mainstay forces of the Croatian armed forces.
The armed forces made liberal use of its political -- and military -- clout to advance its business interests.
Instead, Spitzer bases his fear of an armed citizenry on a theory of international conflict that says weapons are bad and more are worse.
But the position staked out for the administration by Undersecretary of State for Arms Control and International Security John Bolton during the UN small arms conference was an artful denial of the right to armed self-defense.
In its propaganda film Armed to the Teeth, the UN insists civilian disarmament is necessary to prevent tragedies like the 1994 Rwandan genocide, in which as many as 1.1 million people were slaughtered in a 103-day period.
Of course, such arguments sound rational only to someone who believes that the Second Amendment confirms an individual's unalienable right to own and bear firearms - to someone who believes that an armed citizenry, like a free press, is an important bulwark of liberty.