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Strong, developed chest muscles a. You have two mighty muscles on both sides of your chest: The pectoralis major and the pectoralis minor , known collectively as your pecs. Here, we break down the anatomy of your chest muscles, plus how to target each to make them bigger and stronger. Of the two chest muscles, the pectoralis major a.
You have one of these large, fan-shaped slabs on either side of your chest. Each one spans half of the upper chest, and has attachment points on the sternum breastbone , ribs, clavicle collarbone , and humerus long bone of your upper arm. The pec major itself is comprised of two heads, which jointly attach to your upper arm. Both heads have overlapping responsibilities, but also distinct functions depending on the angle of upper arm motion:.
Sternocostal head. Clavicular head. The upper portion of the pec major originates at the clavicle, and helps with the above actions, but also works to flex the humerus raising your arm forward. Different exercises can target a specific head, says Jennifer Novak, M. Bench press. Dumbbell fly. Decline bench press. Incline press. The pec minor is a small, triangular muscle that lies beneath the pec major and, despite sitting on your front, actually controls structures associated with your backside.
In addition to its attachment to the ribs, the pec minor affixes at the coracoid process, which is a small, hook-shaped protrusion atop the shoulder blade. Thanks to these attachment points, the pec minor helps depress pull down and spread apart the shoulder blades, and can assist with breathing. The pec minor pretty much works whenever your pecs work, so isolating it in the gym is no small task. Decline chest press.
