Written by the Fiveable Content Team • Last updated September 2025
Written by the Fiveable Content Team • Last updated September 2025
Definition
The pectoralis minor is a thin, triangular muscle located beneath the pectoralis major in the chest. It plays a crucial role in movements of the shoulder blade, including downward rotation and drawing it forward against the thoracic wall.
A thick, fan-shaped muscle covering much of the upper chest, responsible for movements such as flexion, adduction, and internal rotation of the humerus.
Also known as the shoulder blade, it is a flat, triangular bone located on the posterior side of the rib cage that provides attachment points for multiple muscles including the pectoralis minor.
A muscle that originates on the surface of the 1st to 8th ribs at the side of the chest and inserts along almost all of its length into anterior medial border of scapula, playing a key role in scapular protraction and upward rotation