Pectoralis minor

Dr Craig Hacking and Dr Henry Knipe et al.

Pectoralis minor is a muscle of the anterior chest wall that inserts into the pectoral girdle. It lies deep to and is completely covered by pectoralis major

It is an important anatomical landmark in two senses:

  1. it divides the axillary artery into 3 parts
  2. it divides the axillary lymph nodes into levels

Summary

  • origin: anterior ribs 3-5 near the costal cartilages
  • insertion: medial and upper aspect of the coracoid process of the scapula
  • innervation: medial and lateral pectoral nerves
  • action
    • depresses shoulder
    • when scapula fixed, elevation of ribs 3-5

Variant anatomy

Upper limb anatomy
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Article information

rID: 23254
Section: Anatomy
Synonyms or Alternate Spellings:
  • Pectoralis minor muscle
  • Pec minor

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