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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.



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.


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.
(engineering acoustics)
A ridge or a spur that extends from a mountain.
A side of an angle.
(naval architecture)
The part of an anchor extending from the crown to one of the flukes.
A long, narrow inlet of water extending from another body of water.
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.
The perpendicular distance from the line along which a force is applied to a reference point.


Advanced RISC Machine.

Originally Acorn RISC Machine.


Advanced RISC Machines Ltd.


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


References in periodicals archive ?
Subsequently, Gilson will start bringing in Armen products as the Armen brand, integrating its bench top products into the Gilson branded product portfolio.
Armen says, tapping his fingers on the steering wheel.
His counterpart at King, Jefferson Gregory, has said the probe raised "serious concerns" about the transaction, but Armen said any refusal by King to close the deal would be unjustified.
McCoy reported that Armen, sent off a 4-1 chance, had "jumped with care on the dead ground" on his way to a 24-length defeat of Rob Leach.
The two stores complement each other beautifully, according to Armen Prouudian "Greg and I know each others strengths, as well as each other's inventory," he said "I know which customers to send him, and he knows which ones to send me.
He served as its president in 1975, published influential work in Economic Inquiry (Alchian [1969], an article that Armen views as his best paper), and was instrumental in helping the annual WEA meetings take their present form.
Armen has made significant contributions in revitalizing rural Armenia by creating an unprecedented development program, which provides immediate and sustainable benefits to the country's children and youth.
When asked about new features, Jason Derbyshire, Business Development Manager for Armen Computing says, "Visitors will find enhanced video media including tutorials and webinars to play on-demand.
All that prompted former chief executive and chairman Donal Geaney to resign last June, with Mr Armen stepping in on a temporary basis.
Armen Rustamyan, an official of the National Assembly of the Republic of Armenia, is proposing a sister-city relationship between Glendale and Armenia's capital.
Two of the people here are Nobel prize winners; Bill Sharpe had Armen as his dissertation advisor, and incidentally he also had Harold Demsetz on his committee, so this is kind of old home week for him; Jim Buchanan, another Nobel prize winner, had Armen as a colleague; Axel Leijonhufvud has been in the same economics department as Armen for thirty years.
Armen, PhD, the company's chairman and CEO, will present at the Bear, Stearns & Co, Inc.