086 Pectoral Muscles Review

Leslie Samuel reviews the four pectoral muscles: pectoralis minor, subclavius, serratus anterior, and pectoralis major. The video covers each muscle's origin, insertion, and action, providing a comprehensive review for students. Viewers are encouraged to quiz themselves and use the video as a learning tool. Additional resources are available at interactive-biology.com.

What is the primary action of the pectoralis minor muscle?

• Protracts the scapula

• Depresses the clavicle

• Stabilizes the scapula

• Flexes the humerus

Where does the subclavius muscle originate?

• External surfaces of ribs 1-8

• Medial half of the clavicle

• First rib at the junction with the coastal cartilage

• Anterior surface of ribs 3-5

Which muscle helps with the upward rotation of the scapula?

• Subclavius

• Pectoralis major

• Pectoralis minor

• Serratus anterior

What is the insertion point of the pectoralis major muscle?

• Anterior surface of the medial border of the scapula

• Crest of the greater tubercle of the humerus

• Subclavian groove

• Medial aspect of the coracoid process

Which head of the pectoralis major extends the humerus?

• Neither head

• Both heads

• Sternocostal head

• Clavicular head