Pectoralis Major: Structure, Origins, Insertions, and More (+ 3D models)

The video tutorial provides an in-depth analysis of the pectoralis major muscle, covering its structure, divisions, origins, insertions, innervation, blood supply, and actions. It explains the muscle's three parts: clavicular, sternocostal, and abdominal heads, and their respective origins and insertions. The tutorial also discusses the blood supply from the thoracoacromial trunk and innervation by the pectoral nerves. A 3D model is used to visualize the muscle's anatomy, and the video concludes with a detailed explanation of the muscle's actions, including shoulder flexion, lateral flexion, and medial rotation.

What is the significance of the abdominal head of the pectoralis major?

Describe the innervation of the pectoralis major muscle.

What role does the pectoralis major play in arm wrestling?

How do the origins of the pectoralis major differ from its insertions?