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The Rhomboids.
anterior
anterior
anterior deltoid pectoralis major serratus anterior
1) pectoralis major 2) anterior fibers of deltoid 3) biceps brachii 4) corachobrachialis 1) pectoralis major 2) anterior fibers of deltoid 3) biceps brachii 4) corachobrachialis 1) pectoralis major 2) anterior fibers of deltoid 3) biceps brachii 4) corachobrachialis
The anterior axillary fold is formed by the lower border of the pectoralis major. Some also include the pectoralis minor.
Pectoralis major
Pectoralis major and pectoralis minor
serratus anterior
Serratus anterior
By protraction, I assume that you mean shifting (rotating) the shoulder girdle anteriorly, which involves moving the scalula away from the spine (such as is requires when reaching forward). This motion requires movement at the sternoclavicular, acromioclavicular, and coracoclavicular joints, and is performed by actions of the serratus anterior, pectoralis minor and pectoralis major.The opposite movement, retraction, is backward movement of the shoulder girdle, and involves moving the scapula back toward the spine. Trapezius (middle and lower fibers), rhomboids and latissimus dorsiare responsible for retraction.
Pectoralis major sternocostal part and anterior fibres of Deltoid