What is the primary role of the pectoralis minor muscle?

The primary role of the pectoralis minor muscle is indeed to depress the scapula. This muscle is located beneath the pectoralis major and originates from the third, fourth, and fifth ribs, inserting on the coracoid process of the scapula. When the pectoralis minor contracts, it pulls the scapula downwards and forwards, which is essential in various movements, especially those involving pushing or reaching downward.

Additionally, the pectoralis minor helps stabilize the scapula against the thoracic wall, contributing to the overall shoulder function and movement. Understanding this function emphasizes the muscle's importance in maintaining proper shoulder mechanics during various activities, particularly those involving the upper extremities.