Pectoralis minor muscle

Dr Daniel J Bell and Dr Henry Knipe et al.

The pectoralis minor muscle is a muscle of the pectoral region lying deep to and completely covered by the pectoralis major muscle

It is an important anatomical landmark in two senses:

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

Summary

  • origin: anterior 3rd-5th ribs 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 3rd-5th ribs

Variant anatomy

  • pre-fixed origin: ribs 2-4
  • post-fixed: ribs 4-6
  • absence
Anatomy: Upper limb
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Article information

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

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