Best Exercises for Deltoid Muscles - Stay Fit!
The deltoid muscle ( lat. Musculus deltoideus ) - in human anatomy - the superficial muscle of the shoulder, forming its outer contour. It takes part in flexion and extension of the shoulder, abduction of the arm to the side. Does the name “deltoid” come from the similarity of the triangular shape of the muscle to the Greek letter? (delta). The average muscle weight in humans is about 192 grams. In many animals (for example, cats) it is known as the common muscle of the shoulder.
General information - broad, strong shoulders, this is the main feature of a sporty and fit figure. The shape of the shoulders is formed by the shape of the skeleton and is improved by the development of the deltoid muscles. The deltoid muscles respond well to attention to them. These muscles have the ability to increase the width in the shoulders so that a person with a normal physique can achieve athletic forms.
Location - the deltoid muscles are located above the upper part of the humerus. The front part of the deltoid muscle starts from the outer edge of the clavicle. This is followed by the middle part and, accordingly, the rear part. Thus, three bundles of deltoid muscle fibers pass into the short tendon, converge and cut between the biceps (biceps) and triceps (triceps).
Appointment - the deltoid muscle is designed to lead the shoulder back, forward, sideways, and turns the shoulder around the longitudinal axis. For each of the actions, the corresponding part of the muscle is used. Given the natural properties and purpose of the deltoid muscle, a set of exercises is selected for the development of the deltoid muscle.
The antagonists in the abduction of the arm are the pectoralis major and latissimus dorsi.
The front bundles are involved in lateral abduction of the arm with external rotation of the shoulder. In the flexion of the shoulder, their role is small, but they help in this movement of the pectoralis major muscle (the elbow just below the shoulder). Contribute to the muscles: subclavian, large pectoral and widest backs with internal rotation of the shoulder.
Lateral beams participate in the lateral abduction of the shoulder when it is in internal rotation and in the horizontal abduction in its external rotation, but practically do not participate in horizontal extension of the shoulder (during its internal rotation).
The posterior bundles take a large part in horizontal extension, especially because of the small participation of the latissimus dorsi in this movement in the horizontal plane. Other horizontal extensors - the infraspinatus and the pectoralis minor muscle - also work together with the posterior portion of the deltoid muscle as external rotators, antagonistic to the internal rotators - the pectoralis major and latissimus. The posterior portion of the deltoid muscle also takes a large part in the extension of the shoulder, with the support of the long triceps head.