Pectoralis Minor Muscle #9 by Sebastian Kaulitzki/science Photo Library

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Human Chest Muscles #9 by Sebastian Kaulitzki/science Photo Library

Pectoralis Minor Muscle by Sebastian Kaulitzki/science Photo Library

Pectoralis Minor Muscle By Sebastian Kaulitzki/science

Pectoralis Minor Muscle By Sebastian Kaulitzki/science

Pectoralis Minor Muscle by Sebastian Kaulitzki/science Photo Library

Pectoralis Minor Muscle #4 by Sebastian Kaulitzki/science Photo Library

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Pectoralis Major Muscle #6 by Sebastian Kaulitzki/science Photo Library