Pectoralis minor

Dr Craig Hacking and Dr Henry Knipe et al.

The pectoralis minor muscle is a muscle of the pectoral region lying 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

Anatomy: Upper limb
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Article information

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

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