What are the major muscles of the chest that aid in arm movement called?

The major muscles of the chest that aid in arm movement are indeed known as the pectoralis major and pectoralis minor. The pectoralis major is the larger muscle that covers much of the upper front of the chest and is primarily responsible for movements such as shoulder adduction, flexion, and internal rotation. It plays a critical role in pushing motions, like when performing a push-up or a bench press. The pectoralis minor, located beneath the pectoralis major, assists in stabilizing the shoulder blade and facilitating movements that involve raising the arms.

Together, these muscles are essential for a variety of upper body movements, not just limited to pushing, but also in activities that require reaching and lifting. Understanding the function of these muscles helps in comprehending not only human anatomy but also its implications in physical activity and exercise regimens.