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No they are not
No, when the scapula is retracted it is pinched backwards with both scapula coming closer to the spine. Scapula protraction is when the shoulders are rounded forward by the pectoralis major and or pectoralis minor. The middle section of the trapezius and the rhomboids are responsible for scapula retraction.
Pectoralis minor.
pectoralis major and pectoralis minor
there are two muscles with pectoralis in their name, Pectoralis Major and Pectoralis Minor. Pectoralis Major is the main muscle of the chest and pectoralis minor is deep to it (so you can't feel it because pectoralis major completely covers it)
The trapezium muscles in your upper shoulder area are strong, but also act up because of the tasks that are placed upon them. That task could be called an antagonist.
It's the Pectoralis Minor!
Yes. The pectoralis minor moves from the back to the front of the body while pectoralis major moves from the outside to the inside in the front plane of the body.
The Pectoralis Major (large superficial) and Pectoralis Minor
pectoralis minor and subclavius muscle.
No. They are synergists to each other.
Biceps Brachii Coracobrachialis Deltoid Infraspinatus Latissimus Dorsi Levator Scapulae Omohyoid Pectoralis Minor Rhomboid Major Rhomboid Minor Serratus Anterior Subscapularis Supraspinatus Teres Major Teres Minor Trapezius Triceps Brachii