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The antagonists to the pectorals are the muscles in the upper back, specifically the rhomboids and trapezius. These muscles work in opposition to the pectorals to allow for controlled movement and to prevent injury.
The pectorals are muscles that are considered to be organs. They are fan shaped muscles that are located in the anterior chest.
Your chest muscles.
deltoids
Pecks
Chest muscles
Pectorals
Pectorals
The atissimus obrsi abdominals is the prime mover in a sit up.
There are two muscles that are in your chest. These two muscles are known as the pectorals major and the pectorals minor.
On each side of the anterior of the thorax you have a superficial pectoralis major and a slightly deeper pectoralis minor. There are also the muscles between the ribs called the intercostals, (external, internal and innermost)
Triceps and Pectorals