The best exercises for the deltoid muscles - Be fit!
Deltoid muscle ( lat. Musculus deltoideus ) - in human anatomy - the superficial muscle of the shoulder, forming its outer contour. Takes part in the flexion and extension of the shoulder, leading the arm to the side. The name "deltoid" occurs on the similarity of a triangular muscle with a Greek letter? (delta). The average muscle weight in humans is about 192 grams. In many animals (for example, in cats) it is known as the common muscle of the shoulder.
General information - broad, strong shoulders, this is the main feature of the sports and taut figure. The shape of the shoulders is formed by the shape of the skeleton and is enhanced by the development of the deltoid muscles. Deltoid muscles respond well to attention to them. These muscles have the ability to increase the width of the shoulders so that a person with a normal physique can achieve athletic forms.
Location - deltoid muscles are located above the upper part of the humerus. The anterior part of the deltoid muscle begins at the outer edge of the clavicle. This is followed by the middle part and, accordingly, the rear part. Thus, the three bundles of deltoid muscle go into a short tendon, converge and cut between the biceps (biceps muscle) and triceps (triceps muscle).
Appointment - the deltoid muscle is designed to move the shoulder back, forward, to the side, and turns the shoulder around the longitudinal axis. For each of the actions used the corresponding part of the muscle. Given the natural properties and purpose of the deltoid muscle, a set of exercises is selected for the development of the deltoid muscle.
Antagonists in the abduction of the arm are the pectoralis major and latissimus dorsi muscle.
Front beams participate in lateral abduction of the arm during external rotation of the shoulder. In flexing the shoulder, their role is small, but they help the pectoralis major muscle in this movement (elbow just below the shoulder). Contribute to the muscles: subclavian, large pectoral and widest back with the internal rotation of the shoulder.
Lateral beams are involved in lateral abduction of the shoulder in its position in internal rotation and in horizontal abstraction during its external rotation, but they practically do not participate in the horizontal extension of the shoulder (in its internal rotation).
The back beams take a large part in the horizontal extension, especially due to the small participation of the latissimus dorsi in this movement in the horizontal plane. Other horizontal extensors - subosseous and small round muscles - also work together with the posterior portion of the deltoid muscle as external rotators, antagonistic to internal rotators - large pectoral muscles and the broadest. The posterior portion of the deltoid muscle also takes a large part in the over-flexion of the shoulder, with the support of the long triceps head.