What is the flexion of the shoulders?

The shoulder flexion is caused by lifting the arm forward in front of the body. The initiated pectoralis major and the front deltoid muscles with the help of biceps contain flexion to glenohumeral or shoulder, joint, the ball in the combat joint. From the starting position with the arm down on the side, approximately 180 degrees of flexion of the arms can be reached until the arm is directly above the head. Flexion can happen with the palm facing inwards, a palm facing backwards or a palm facing forward. The type of synovial or movable joint called the joint with the ball and cut, the arm allows the arm movement in almost all directions when the head of the humerus rolls in the gllenoid cavity as the ball in the cup. One such movement is the flexion of the arm in which the arm is raised vertical direction forward.

The shoulder flexion is mostly allowed by two main muscles of the upper body: pectoralis major and front deltoid. In the main muscle of the chest pectoralis is the upper part known as the clavicularThe head, which is based on the collarbone and connects to the front of the humerus, for bending the arm forward. The pectoralis Major is the front part of the deltooid, the muscle covering the shoulder. The front deltooid, coming from the collarbone close to the pectoralis and inserts into the front external aspect of the humerus, works with the clavicular head of the pectoralis to form a flexion of the shoulders. It's particularly active when the elbow is tilted out.

The other muscles are involved in the flexion of the shoulders depending on the rotation of the shoulder during the flexion. When the arms turn so that the palm of the hand points forward, the muscles of the biceps Brachia and the coracobrachialis in the front of the upper arm helped lift the arm forward. Their post is weaker when the arm is neutral. In the medially or internally, the rotated position turned the pectoralis smaller in the chest and the muscle subcapularis rotator cuff helps in the flexion of the arm, especially stabilizing the head of the humerus in the gluenoid cavity when the arm is raised.