Pectoralis Major Anatomy Quiz

What are the two main portions of the pectoralis major muscle?

• Sternocostal and trapezius

• Clavicular and sternocostal

• Sternocostal and deltoid

• Clavicular and deltoid

Where does the clavicular head of the pectoralis major originate?

• Sternum

• Lateral half of the clavicle

• Medial half of the clavicle

• Entire clavicle

The sternocostal head of the pectoralis major is attached to which structures?

• Lateral half of the clavicle

• Entire sternum

• Upper six costal cartilages

• Lower six costal cartilages

What is the role of the aponeurosis in the origin of the sternocostal head?

• It connects to the clavicle

• It connects to the external oblique muscle

• It connects to the deltoid muscle

• It connects to the trapezius muscle

Where does the pectoralis major insert on the humerus?

• Medial epicondyle

• Crest of the greater tubercle

• Lesser tubercle

• Greater tubercle

What action is performed by the clavicular head of the pectoralis major?

• Abduction of the humerus

• Flexion of the humerus

• Extension of the humerus

• Lateral rotation of the humerus

What action is performed by the sternocostal head of the pectoralis major?

• Abduction of the humerus

• Lateral rotation of the humerus

• Flexion of the humerus

• Extension of the humerus

What is the combined action of the entire pectoralis major muscle?

• Abduction and lateral rotation

• Adduction and medial rotation

• Flexion and lateral rotation

• Extension and abduction

Which action is NOT performed by the pectoralis major?

• Adduction of the humerus

• Medial rotation of the humerus

• Lateral rotation of the humerus

• Extension of the humerus

What is the primary function of the pectoralis major during arm movement?

• To abduct the arm

• To adduct the arm

• To laterally rotate the arm

• To stabilize the shoulder