Muscle Anatomy

pectoralis minor

The pectoralis minor, a smaller chest muscle, lies beneath the pectoralis major, contributing to scapular and rib movements.

Arising from the third to fifth ribs near their costal cartilages, the pectoralis minor originates along the anterior surface of the ribs.

The muscle inserts into the coracoid process of the scapula, a bony prominence at the anterior aspect of the shoulder blade.

The primary function of the pectoralis minor is to depress and protract the scapula, pulling it downward and forward. Additionally, it aids in stabilizing the scapula against the thoracic wall and assists in the elevation of the ribs during forced inhalation. While a smaller muscle, the pectoralis minor plays a crucial role in maintaining scapular positioning and contributing to overall shoulder and chest function.