Pectoralis minor muscle

Last revised by Henry Knipe on 28 Jun 2023

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 3 levels


Variant anatomy

  • pre-fixed origin: ribs 2-4

  • post-fixed origin: ribs 4-6

  • absence: seen in Poland syndrome

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Cases and figures

  • Figure 1: pectoral muscles (Gray's illustrations)
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  • Case 1: Poland syndrome
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