The pectoral muscles, commonly referred to as the pecs, are a pair of large, fan-shaped muscles located in the chest region of the human body. Forming an integral part of the upper body musculature, the pectoral muscles are comprised of two major muscles, namely the pectoralis major and pectoralis minor.
The pectoralis major is the larger of the two muscles, positioned towards the front of the chest, and is responsible for the bulk of the chest's appearance. It originates from the clavicle, sternum, and upper ribs, before inserting into the upper arm bone. The pectoralis major aids actions such as flexion, adduction, and medial rotation of the arm, as well as playing a significant role in movements involving the shoulder joint.
On the other hand, the pectoralis minor is a smaller muscle located beneath the pectoralis major. It originates from the third, fourth, and fifth ribs, attaching to the scapula, which is the shoulder blade. The pectoralis minor assists in stabilizing the shoulder by drawing the scapula forward and downward, as well as elevating the ribs during inhalation.
Overall, the pectoral muscles contribute to various upper body movements, particularly those involving the arm, shoulder, and breathing. Regular exercise targeting these muscles can enhance strength, shape, and overall appearance of the chest area.
