Musculus Pectoralis Major, commonly known as the pectoralis major muscle, is a large, fan-shaped muscle located in the upper chest region of the human body. It is one of the primary muscles of the upper body, responsible for various movements and functions.
The pectoralis major muscle originates from two main points: the clavicle (collarbone) and the sternum (breastbone). It also has attachments to the upper ribs, humerus (arm bone), and shoulder girdle. These points of origin and insertion allow the muscle to have a wide range of movements and provide stability to the shoulder joint.
The primary function of the pectoralis major muscle is to bring the arm toward the midline of the body, commonly known as adduction. This movement is often referred to as "hugging" or "crossing" the arms. Additionally, it helps in the flexion and medial rotation of the arm at the shoulder joint, allowing actions such as throwing a ball or pushing movements.
The pectoralis major muscle is also significant in providing support and stability to the shoulder joint during activities that involve lifting, pushing, or pulling heavy objects. It contributes to overall upper body strength and power.
Regular exercise and strength training of the pectoralis major muscle can help improve upper body strength, posture, and aesthetics. However, overuse or excessive strain on the muscle can lead to injury or discomfort, such as strains or muscle tears.
In conclusion, the pectoralis major muscle is a prominent muscle in the upper body with various functions, including arm adduction, flexion, and medial rotation. It contributes to overall upper body strength and plays a crucial role in shoulder joint stability.
