Anatomical Variations of the Pectoralis Major Muscle: Notes on Their Impact on Pectoral Nerve Innervation Patterns and Discussion on Their Clinical Relevance

<div>Anatomy of the tendon of the pectoralis major muscle fused with the deltoid muscle. (a) The right pectoralis major muscle and the deltoid muscle seen from behind. Posterior lamina (PL) of the pectoralis major muscle tendon constitutes place of attachment for the lower fibers of the sternocostal (STC) part of the muscle. (b) The tendon of the pectoralis major muscle seen from behind. Posterior lamina (PL) of the pectoralis major muscle has been separated and reflected to expose the posterior view to the anterior lamina (AL) of the tendon. White arrowheads show the insertion of the pectoralis major muscle. CL: clavicular part of the pectoralis major muscle.</div>

BioMed Research International

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Figure 5

Figure 5: Anatomical Variations of the Pectoralis Major Muscle: Notes on Their Impact on Pectoral Nerve Innervation Patterns and Discussion on Their Clinical Relevance 

Figure 5 | Anatomical Variations of the Pectoralis Major Muscle: Notes on Their Impact on Pectoral Nerve Innervation Patterns and Discussion on Their Clinical Relevance 