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Biceps brachii muscle
The biceps brachii is arguably the best known muscle, as it lies fairly superficially, and is often well-defined even in non-athletes. The muscle is popular amongst bodybuilders, and can grow quite large through weight training.
The term biceps brachii is a Latin phrase meaning "two-headed [muscle] of the arm", in reference to the fact that the muscle consists of two bundles each with its own origin but with a common insertion point near the elbow.
Note that the word biceps is used in both singular and plural: the form bicep, although common, is incorrect. (The proper Latin plural bicipites is considered pedantic and rarely used in English.)
Proximally, the short head of the biceps attaches to the coracoid process of the scapula. The tendon of the long head passes into the joint capsule at the head of the humerus, and attaches on the scapula at the supraglenoid tubercle.
Distally, biceps attaches to the radial tuberosity, and because this bone can rotate, the biceps also supinates the forearm. The biceps also connects with the fascia of the medial side of the arm, at the bicipital aponeurosis.
Two additional muscles lie underneath the biceps brachii. These are the coracobrachialis muscle, which like the biceps attaches to the coracoid process of the scapula, and the brachialis muscle which connects to the ulna and the humerus.
The biceps is tri-articulate, meaning that it works across three joints. The most important of these functions are to flex the elbow and to supinate the forearm.
These joints and the associated actions are as follows:
There are many forms of resisted elbow flexion, better known as a curling motion, which exercise the biceps.
Some common iterations include:
Working out the upper back muscles through rowing and pulling motions will also incorporate some Biceps Brachii due to great amounts of necessary elbow flexion. However, simultaneous extension of the glenohumeral joint will result in some lengthening of the biceps, thus weakening the biceps' contraction and deferring a great deal of the elbow flexion work to the brachialis and brachioradialis. The role of the biceps during such motions is what is known as a dynamic stabilizer.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Biceps_brachii_muscle". A list of authors is available in Wikipedia.|