The pectoralis major and minor are muscles located in the chest region of the human body. They belong to the group of skeletal muscles and play a significant role in the movement and stability of the shoulder joint.
The pectoralis major is a large, fan-shaped muscle that covers the anterior aspect of the chest. It originates from the clavicle, sternum, and upper ribs and inserts into the humerus bone of the upper arm. The muscle provides the primary power for motions such as shoulder flexion, adduction, and medial rotation.
The pectoralis minor, on the other hand, is a smaller muscle that lies beneath the pectoralis major. It originates from the third, fourth, and fifth ribs and inserts into the coracoid process of the scapula. The muscle aids in stabilizing the scapula and plays a role in movements like protraction and downward rotation of the shoulder blade.
Both muscles are innervated by the medial and lateral pectoral nerves, which arise from the brachial plexus. The pectoralis major and minor work together to provide strength, stability, and control to the shoulder joint. They are actively involved in various upper body movements, including pushing, lifting, and throwing.
In summary, the pectoralis major and minor are muscles located in the chest that are crucial for shoulder movements and stability. They work in unison to provide power and control in activities involving the upper body.
