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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. Uniting part of the way down the arm, the heads swell into the belly, or muscle proper. This tapers to a tendon that rounds the elbow and attaches to the ulna, the larger of the two forearm bones. Since contraction of the triceps straightens the arm, the muscle is called an extensor. It also helps lock the elbow when the forearm pushes forward against resistance. The triceps works in coordination with a flexor muscle, 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 of the upper arm.
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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



a muscle that arises from three heads. The triceps muscle of the arm, situated on the posterior surface of the humerus, extends the forearm at the elbow joint. The triceps muscle of the calf is at the back of the leg below the knee; it consists of the two-headed gastrocnemius muscle and the one-headed soleus muscle, and it flexes the foot at the ankle joint.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


any muscle having three heads, esp the one (triceps brachii) that extends the forearm
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
Abbreviations: AD = anterior deltoid, BB = biceps brachii, EMG = electromyography, MD = middle deltoid, ME = mechanical effectiveness, MVC = maximum voluntary isometric contraction, PC = principal component, PCA = principal component analysis, PD = posterior deltoid, PM = pectoralis major, SCI = spinal cord injury, sEMG = surface electromyography, TB = triceps brachii, UT = upper trapezius.
(18), in which was investigated the relationship between strength and EMG signal of agonists and antagonists muscles of the elbow flexion (biceps brachii, brachioradialis and triceps brachii).
The absolute weight of triceps brachii muscle of control males was significantly superior to that of the Phenobarbital exposed (P< 0.05) (Table 2).
(6,7) Key trigger points include: (8) Key trigger point Associated satellite trigger point sternocleidomastoid temporalis, masseter upper trapezius temporalis, masseter scalene deltoid, extensor carpi radialis, extensor digitorum communis splenius capitis temporalis supraspinatus deltoid, extensor carpi radialis infraspinatus biceps brachii pectoralis minor flexor carpi radialis, flexor carpi ulnaris latissimus dorsi triceps brachii, flexor carpi ulnaris serratus posterior superior triceps brachii, extensor digitorum communis, extensor carpi ulnaris quadratus lumborum gluteus maximus, piriformis piriformis hamstrings hamstrings gastrocnemius, soleus
Radial Triceps brachii, wrist/hand extensors Median Wrist flexors, hand muscles Ulnar Wrist flexors, hand muscles Nerve Important Functions Musculocutaneous Elbow flexion Axillary Shoulder abduction & stability Suprascapular Shoulder abduction & stability Radial Elbow, wrist, & finger extension Median Wrist flexion, hand function Ulnar Wrist flexion, hand function Figure 7.
Zona del lomo el Latissimus dorsi y zona de espalda y costillas el Triceps brachii. De la porcion del muslo fueron seleccionados 4 musculos por ser esta la que mayor masa muscular presenta.
Los musculos evaluados son: Pectoralis major, Supracoracoideus, Coracobrachialis cranialis, Coracobrachialis caudalis, Scapulohumeralis, Subcoracoscapularis (pars subscapularis y pars subcoracoideus), Rhomboideus superficialis, Rhomboideus profundus, Extensor digitorum comunis, Deltoideus major, Deltoideus minor, Biceps brachii y Triceps brachii (pars scapulotriceps, pars humerotriceps y pars coracotriceps).
Muscles include deltoid posterior (DP), middle (DM), and anterial (DA), pectorelis major clavicle portion (PC), biceps brachii (BB) including biceps long (BBlh) and biceps short (BBsh) , triceps brachii (TB) including triceps lateral (TBlt), triceps long (TBlh) and triceps mid (TBmd), brachialis (BS), brachioradialis (BR), pronator teres (PT), supinator (SP) and pronator quadratus (PQ).