Pectoralis minor

A thin, triangular muscle located in the upper chest area, contributing to shoulder movement.

Pectoralis minor is a small chest muscle situated beneath the larger pectoralis major. It originates from the third, fourth, and fifth ribs, running upwards and laterally to its insertion point at the coracoid process of the scapula. This muscle plays a crucial role in the movement and stabilization of the shoulder girdle.

Terminologia Anatomica

pectoralis-minor

System

Muscular system

Function

The primary function of the pectoralis minor is to stabilize the scapula by drawing it forward and downward, which is essential for various arm movements. This muscle assists in the elevation of the ribs during deep inhalation, contributing to respiratory function as well. In activities such as pushing or pulling, the pectoralis minor plays a supportive role, enabling the shoulder girdle to maintain a stable base for the larger muscles involved in such movements. Additionally, it helps in the inward rotation and adduction of the arm, enhancing the overall range of motion and functionality of the shoulder joint.

Location

The pectoralis minor is located on the anterior thoracic wall, beneath the pectoralis major muscle. Its attachment points make it a crucial structure in the upper chest region. Positioned laterally from the sternum, it spans across to the coracoid process of the scapula, lying flat against the ribs. This anatomical positioning allows it to serve efficiently in its roles of shoulder stabilization and respiratory support, while also interacting with surrounding muscles and nerves.

Did You Know?

Despite its small size, the pectoralis minor is vital for proper shoulder movement and function.
It can become tight due to poor posture, leading to shoulder discomfort and reduced range of motion.
The pectoralis minor is often involved in rehabilitation exercises aimed at improving shoulder stability.