brystvirvlene

Brystvirvlene, also known as pectoral muscles or pectoralis major, are a pair of large, fan-shaped muscles located in the chest region of the human body. They are responsible for a wide range of movements, including the flexion, adduction, and internal rotation of the arm, as well as the extension of the shoulder joint. The pectoralis major is the primary muscle used in pushing movements, such as those performed in bench press exercises.

The pectoralis major is a broad, flat muscle that originates from the clavicle, sternum, and ribs, and inserts onto the humerus, the bone of the upper arm. It is innervated by the medial and lateral pectoral nerves, which are branches of the brachial plexus. The pectoralis major is a powerful muscle that plays a crucial role in both daily activities and athletic performance.

Injuries to the pectoralis major can occur due to overuse, trauma, or poor technique during exercise. Common injuries include strains, tears, and impingement syndrome, which can lead to pain, weakness, and reduced range of motion. Proper warm-up, technique, and strength training can help prevent these injuries and promote muscle health.

The pectoralis major is an essential muscle for both men and women, contributing to overall upper body strength and aesthetics. It is a key target muscle in many strength training programs and is often a focus of bodybuilding and fitness competitions.