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

Figure 7

The general pattern of innervation of the lateral and medial pectoral nerves observed on specimen stained by using Sihler’s method. The detailed intramuscular distribution of certain nerve sub-branches was exposed. Branches of the intercostal nerves distributed within pectoralis major muscle were marked by black arrowheads. CL: clavicular part of the pectoralis major muscle; LPN: branches of the lateral pectoral nerve; MPN: branches of the medial pectoral nerve; STC: sternocostal part of the pectoralis major muscle.