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Answer:
In the context of muscle anatomy and fitness, "pecs" typically refers to the pectoralis major muscles, which are located in the chest area. The pectoralis major muscles can be categorized into three clusters or parts:
1. Clavicular (Upper) Pectoral Region: This is the upper part of the pectoralis major muscle, which originates from the clavicle (collarbone) and inserts into the upper arm (humerus). It contributes to movements like shoulder flexion (raising the arm).
2. Sternal (Middle) Pectoral Region: This is the middle part of the pectoralis major muscle, originating from the sternum (breastbone) and inserting into the humerus. It is responsible for movements like horizontal adduction (bringing the arm across the body).
3. Costal (Lower) Pectoral Region: This is the lower part of the pectoralis major muscle, originating from the ribs and inserting into the humerus. It assists in movements like shoulder extension (moving the arm backward).
These clusters or parts of the pectoralis major muscles play important roles in various upper body movements and exercises, such as bench presses, push-ups, and chest flies.