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

<div>The main anatomical variations related to morphology of the pectoralis major muscle. (a) Typical morphology of the pectoralis major muscle. (b) A separate clavicular part (CL) of the pectoralis major muscle. In these cases, a distinct cleft is visible between the clavicular (CL) and sternocostal portion (STC) of the pectoralis major muscle. (c) The hypotrophy of the clavicular part (hCL) of the pectoralis major muscle. (d) Fusion between the clavicular part (CL) of the pectoralis major muscle and the deltoid muscle (DM). The deltopectoral groove is absent and there is no visible borderline between clavicular portion (CL) of the pectoralis major muscle and the deltoid muscle (DM). The brachial segment of the cephalic vein is absent.</div>

BioMed Research International

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Figure 1

Figure 1: Anatomical Variations of the Pectoralis Major Muscle: Notes on Their Impact on Pectoral Nerve Innervation Patterns and Discussion on Their Clinical Relevance 

Figure 1 | Anatomical Variations of the Pectoralis Major Muscle: Notes on Their Impact on Pectoral Nerve Innervation Patterns and Discussion on Their Clinical Relevance 