Rinnalõngu

Rinnalõngu, also known as the pectoralis minor muscle, is a small, triangular muscle located beneath the pectoralis major muscle in the chest. It originates from the third, fourth, and fifth ribs near their costal cartilages and inserts onto the coracoid process of the scapula. Its primary actions include stabilizing the scapula by drawing it downward and forward against the thoracic wall. It also assists in raising the ribs when the scapula is fixed, contributing to respiration.

The pectoralis minor plays a role in movements of the shoulder girdle, particularly in activities involving reaching or pushing. Due to its position and function, it can become tight or overactive in individuals who spend prolonged periods with rounded shoulders, such as those working at desks or engaging in certain athletic activities like throwing. Tightness in the pectoralis minor can contribute to postural issues, limited shoulder mobility, and even impingement syndromes. Stretches and mobility exercises targeting this muscle are often recommended for improving posture and shoulder health. It is innervated by the medial and lateral pectoral nerves.