MUSCLE OF THE DAY: “Pectoralis Minor”
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The pectoralis minor is a thin, triangular muscle situated at the upper part of the chest deep to the pectoralis major. Together, the pec major and minor form the anterior wall of the axilla (space below the shoulder through which vessels and nerves enter and leave the upper arm, a.k.a. armpit).
Origin (proximal attachment): Anterior surface of the costal cartilages of ribs 3-5.
Insertion (distal attachment): Medial border of coracoid process of scapula.
Actions: Scapula protraction, medial aka downward scapula rotation, and depression of the scapula when force is required in addition to gravity. Scapula stabilization on thoracic wall. Pec minor can also be used as an accessory muscle of respiration (when inspiration is deep and forced).
Common Injuries to the Pec Major:
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