from the GNU version of the Collaborative International Dictionary of English.

  • noun (Anat.) A bundle or fascicle of muscular fibers.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun anatomy A bundle or fascicle of muscular fibres.


from Wiktionary, Creative Commons Attribution/Share-Alike License

Latin, the upper arm.


  • O quam formosus lacertus hic quidam inquit ad aequales conversus; at illa, publicus, inquit, non est.

    Anatomy of Melancholy

  • In tremoribus vulgaribus, æqualibus temporum intervallis, non musculus, sed artus ipsemet alternatim attollitur aut deprimitur, aut in oppositas partes it atque redit per minima tamen spatiola; in palpitatione verò sine ullo ordine musculi unius lacertus subito subsilit, nec regulariter continuoque movetur, sed nunc semel aut bis, nunc minimé intra idem tempus subsilit; an causa irritans in sensorio communi, an in musculo ipse palpitante Quærenda sit, ignoramus.

    An Essay on the Shaking Palsy

  • Lizard, through such forms as _lesarde_, _lezard_, _lagarto_, _lacerto_, is from the Latin _lacertus_, a lizard; while closely related is the word alligator by way of _lagarto_, _aligarto_, to alligator.

    The Log of the Sun A Chronicle of Nature's Year

  • —Occasionally doubled; additional slips to the Supinator, Pronator teres, Biceps, lacertus fibrosus, or radius are more rarely found.

    IV. Myology. 7d. The Muscles and Fasciæ of the Arm

  • —A third head (10 per cent.) to the Biceps brachii is occasionally found, arising at the upper and medial part of the Brachialis, with the fibers of which it is continuous, and inserted into the lacertus fibrosus and medial side of the tendon of the muscle.

    IV. Myology. 7d. The Muscles and Fasciæ of the Arm

  • It ascends obliquely in the groove between the Biceps brachii and Pronator teres and crosses the brachial artery, from which it is separated by the lacertus fibrosus; filaments of the medial antibrachial cutaneous nerve pass both in front of and behind this portion of the vein.

    VII. The Veins. 3c. The Veins of the Upper Extremity and Thorax

  • As it descends through the arm, it lies at first lateral to the brachial artery; about the level of the insertion of the Coracobrachialis it crosses the artery, usually in front of, but occasionally behind it, and lies on its medial side at the bend of the elbow, where it is situated behind the lacertus fibrosus (bicipital fascia), and is separated from the elbow-joint by the Brachialis.

    IX. Neurology. 6b. The Anterior Divisions

  • The Biceps brachii is a flexor of the elbow and, to a less extent, of the shoulder; it is also a powerful supinator, and serves to render tense the deep fascia of the forearm by means of the lacertus fibrosus given off from its tendon.

    IV. Myology. 7d. The Muscles and Fasciæ of the Arm

  • —The artery is superficial throughout its entire extent, being covered, in front, by the integument and the superficial and deep fasciæ; the lacertus fibrosus (bicipital fascia) lies in front of it opposite the elbow and separates it from the vena mediana cubiti; the median nerve crosses from its lateral to its medial side opposite the insertion of the Coracobrachialis.

    VI. The Arteries. 4b. 2. The Brachial Artery

  • The brachial artery occupies the middle of the space, and divides opposite the neck of the radius into the radial and ulnar arteries; it is covered, in front, by the integument, the superficial fascia, and the vena mediana cubiti, the last being separated from the artery by the lacertus fibrosus.

    VI. The Arteries. 4b. 2. The Brachial Artery


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  • L. lacertus (sg.) = 1. upper arm, the muscular part of the arm from the shoulder to the elbow; 2. arm; 3. shoulder.

    February 12, 2012