Arm


Arm
Armenian.

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I
Upper limb of a biped, particularly a primate.

Primate arms have one long bone, the humerus, in the upper arm above the elbow, and two thinner bones, the radius and ulna, in the forearm. The triceps muscle straightens the forearm at the elbow joint; the brachialis and biceps muscles bend it. Forearm and small muscles in the hand move the hand and fingers. The term may also denote the limb or the locomotive or prehensile organ of an invertebrate (e.g., the ray of a starfish or the tentacle of an octopus).
II
(as used in expressions)
shield of arms

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  in zoology, either of the forelimbs or upper limbs of ordinarily bipedal vertebrates, particularly humans and other primates. The term is sometimes restricted to the proximal part, from shoulder to elbow (the distal part is then called the forearm). In brachiating (tree-swinging) primates the arm is unusually long.

  The bones of the human arm, like those of other primates, consist of one long bone, the humerus, in the arm proper; two thinner bones, the radius and ulna, in the forearm; and sets of carpal and metacarpal bones in the hand and digits in the fingers. The muscle that extends, or straightens, the arm is the triceps (triceps muscle), which arises on the humerus and attaches to the ulna at the elbow; the brachialis and biceps muscles (biceps muscle) act to bend the arm at the elbow. A number of smaller muscles cover the radius and ulna and act to move the hand and fingers in various ways. The pectoralis muscle, anchored in the chest, is important in the downward motion of the entire arm and in quadrupeds pulls the limb backward in locomotion.

      The term arm may also denote the limb or the locomotive or prehensile organ of an invertebrate, such as the ray of a starfish, tentacle of an octopus, or brachium of a brachiopod.

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Universalium. 2010.

Synonyms:

Look at other dictionaries:

  • arm — ärm …   Kölsch Dialekt Lexikon

  • Arm — Arm, n. [AS. arm, earm; akin to OHG. aram, G., D., Dan., & Sw. arm, Icel. armr, Goth. arms, L. armus arm, shoulder, and prob. to Gr. ? joining, joint, shoulder, fr. the root ? to join, to fit together; cf. Slav. rame. ?. See {Art}, {Article}.] 1 …   The Collaborative International Dictionary of English

  • Arm — Arm, ärmer, ärmste, adj. et adv. welches überhaupt den Zustand der Beraubung einer Sache ausdruckt, und zwar, 1. In eigentlicher Bedeutung, des zeitlichen Vermögens beraubt. Ein armer Mensch, ein armer Mann, eine arme Frau. Arm seyn. Arm werden.… …   Grammatisch-kritisches Wörterbuch der Hochdeutschen Mundart

  • ARM — steht für: Arm, eine der oberen Extremitäten des menschlichen Körpers Arm (Name), ein biblischer Name Arm (Stern), der Stern Eta Capricorni arm steht für: arm, Adjektiv, siehe Armut Personen mit Namen Arm sind: Mark Arm (* 1962), US… …   Deutsch Wikipedia

  • arm — arm1 [ärm] n. [ME < OE earm; akin to L armus, Goth arms, OHG arm: see ART1] 1. a) an upper limb of the human body b) in anatomy, the part of the upper limb between the shoulder and the elbow c) in nontechnical use, the part of the upper limb… …   English World dictionary

  • Arm — …   Deutsch Wikipedia

  • arm — arm; arm·ful; arm·less; arm·let; arm·scye; dis·arm; en·arm; re·arm; un·arm; ARM; dis·arm·er; dis·arm·ing·ly; …   English syllables

  • Arm — Arm: Die gemeingerm. Körperteilbezeichnung mhd., ahd. arm, got. arms, engl. arm, schwed. arm beruht mit verwandten Wörtern in anderen idg. Sprachen auf einer Bildung zu der idg. Wurzel *ar‹ə› »fügen, zupassen«, vgl. z. B. lat. armus »Oberarm,… …   Das Herkunftswörterbuch

  • Arm — Arm, v. t. [imp. & p. p. {Armed}; p. pr. & vb. n. {Arming}.] [OE. armen, F. armer, fr. L. armare, fr. arma, pl., arms. See {arms}.] 1. To take by the arm; to take up in one s arms. [Obs.] [1913 Webster] And make him with our pikes and partisans A …   The Collaborative International Dictionary of English

  • Arm — Sm std. (8. Jh.), mhd. arm, ahd. ar(a)m, as. arm Stammwort. Aus g. * arma m. Arm , auch in gt. arms, anord. armr, ae. earm, afr. erm. Dieses aus einem indogermanischen Wort für Schultergelenk, Arm , das in zwei Ablautformen * arə mo und * ṛə mo… …   Etymologisches Wörterbuch der deutschen sprache

  • arm — Ⅰ. arm [1] ► NOUN 1) each of the two upper limbs of the human body from the shoulder to the hand. 2) a side part of a chair supporting a sitter s arm. 3) a narrow body of water or land projecting from a larger body. 4) a branch or division of an… …   English terms dictionary


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