Bröstkorgsmuskulaturen

Bröstkorgsmuskulaturen, often referred to as the chest muscles, plays a vital role in respiration and upper body movement. The primary muscles within this group are the pectoralis major and pectoralis minor. The pectoralis major is a large, fan-shaped muscle that originates from the clavicle, sternum, and upper ribs, and inserts onto the humerus. Its main functions include adduction, medial rotation, and flexion of the arm at the shoulder joint. The pectoralis minor is a smaller muscle situated beneath the pectoralis major. It originates from the ribs and inserts onto the coracoid process of the scapula. Its primary actions are to stabilize the scapula and assist in downward and forward movement.

Beyond the pectoralis muscles, the intercostal muscles are crucial for breathing. These muscles are located between the ribs. The external intercostals elevate the ribs, aiding in inhalation, while the internal intercostals depress the ribs, assisting in forced exhalation. The diaphragm, a dome-shaped muscle located at the base of the thoracic cavity, is the primary muscle of respiration. Its contraction flattens it, increasing the volume of the thoracic cavity and drawing air into the lungs. The serratus anterior, located on the side of the chest, also contributes to thoracic wall function by protracting and rotating the scapula. Together, these muscles form a complex system that facilitates both movement and the essential process of breathing.