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 ?
Armen Ashotyan greatly emphasized the NATO support to the OSCE Minsk Group Co-Chairs mediatory efforts, as well as underscored that the positions on the NK conflict in the political documents adopted by the NATO should completely reflect the efforts of the OSCE Minsk Group Co-Chairs.
Like this, when Armen is playful, open and earnest, he most resembles Armenouhi, and for a second, Sarkis feels a tremendous loss.
Color is the biggest factor in rug choice, according to Armen Proudian.
What follows are six of the nineteen original papers that were presented in his honor at the conference, the roundtable discussion on Armen as a person and his influence, and a piece where Armen offers young scholars five Principles of Professional Advancement.
Armen is focused on developing improved treatments to fight cancer at Antigenics, a biotechnology company he founded in 1994.
In his speech Armen Ashotyan has also talked about the conflicts existing in the Eastern Partnership countries and has noted that the Euronest is not a platform of the conflicts' settlement, however it can be observed as a unique means for the political dialogue of conflicting states, particularly between the colleagues of Armenia and Azerbaijan.
Armen Computing, Ltd was founded in 1999 with the publication of TradeLog software.
Dr Armen explained: "Firstly, it is a rare event that these kinds of assets come up for sale.
The other thing I wanted to relate briefly was the third lecture that Armen gave in his graduate Price Theory class.
Armen will provide an overview of the company and its priority development programs, including Oncophage(R) (vitespen) therapeutic cancer vaccine; AG-707 therapeutic vaccine for genital herpes infection; Aroplatin(TM) platinum agent for cancers; QS-21 vaccine adjuvant; and AU-801, a novel preclinical application of Antigenics' proprietary heat shock protein technology as a treatment for autoimmune disorders.
On September 8, the Chair of the RA NA Standing Committee on Foreign Relations Armen Ashotyan took part in the conference organized on the PACE initiative in Lisbon at the invitation of Portugals Parliament, where he delivered a speech on the mechanisms of the parliamentary cooperation within the framework of the policy connected with the Diaspora.
The Armenian Police have found the alleged murder of Armen Yepremyan, a kingpin from Moscow, the press