Understanding the Pectoralis Major Division 🌟 🔍 Anatomical Divisions: The pectoralis major is typically divided into two or three sections in the literature. 👉 Upper portion (clavicular head) 👉 Middle portion (sternal head) 👉 Lower portion (costal head) However, some consider the sternal head and costal head as one section (sternocostal part), effectively viewing the division into just two main parts. 💪Although all fibers of the pectoralis major cooperate during movements, the load on each