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The triceps, or triceps brachii (Latin for "three-headed muscle of the arm"), is a large muscle on the back of the upper limb of many vertebrates. It consists of three parts: the medial, lateral, and long head. [1] It is the muscle principally responsible for extension of the elbow joint (straightening of the arm).
The lateral intermuscular septum extends from the lower part of the crest of the greater tubercle of the humerus, along the lateral supracondylar ridge, to the lateral epicondyle; it is blended with the tendon of the deltoid muscle, gives attachment to the triceps brachii behind, and to the brachialis, brachioradialis, and extensor carpi radialis longus muscles in front.
For example, the triceps brachii contracts, producing a shortening (concentric) contraction, during the up phase of a push-up (elbow extension). During the down phase of a push-up, the same triceps brachii actively controls elbow flexion while producing a lengthening (eccentric) contraction. It is still the agonist, because while resisting ...
The triceps brachii has a potential to entrap the radial nerve in the triangular interval secondary to hypertrophy. The presence of a fibrous arch in the long head and lateral head further complicates the situation. Repeated forceful extension seen in weight training and sport involving punching may be a precedent to this scenario.
Lateral: the long head of the triceps; Superior: Teres minor; For the superior border, some sources list the teres minor, [2] [5] while others list the subscapularis. [6]
Triceps is the major extensor and brachialis and biceps the major flexors. Biceps is, however, the major supinator and while performing this action it ceases to be an effective flexor at the elbow. [8] Muscles of the arm [4] Posterior Triceps brachii, anconeus Anterior Brachialis, biceps brachii
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While executing a rope push-down, the palms face in and the arms internally rotate while pushing down. This variation works all three parts of the triceps, but especially the lateral head (coloured yellow Figure 2). [1] Figure 2: The triceps muscle, showing the lateral head (yellow), the long head (red) and the medial head (green).