Advanced Transversus Thoracis Quiz

Q1. Which description best characterizes the origin of transversus thoracis?

• Lateral third of the clavicle
• Posterior lower sternum and xiphoid region
• Superior border of the scapula
• Anterior surfaces of thoracic vertebrae

Q2. Which description best characterizes the insertion of transversus thoracis?

• Superior surface of the clavicle
• Internal surfaces of the second through sixth costal cartilages
• External surfaces of the lower six ribs
• Spinous processes of T1 through T6

Q3. Which major vessels descend vertically near the lateral border of transversus thoracis?

• Internal thoracic vessels
• Brachial vessels
• Pulmonary vessels
• Renal vessels

Q4. The internal thoracic vessels are positioned between transversus thoracis and which structures in the anterior intercostal spaces?

• Visceral pleura and lung
• Vertebral bodies and sympathetic trunks
• Scapula and serratus anterior
• Costal cartilages and internal intercostal structures

Q5. Which anatomical feature of transversus thoracis is notably variable among individuals?

• Number and extent of its muscular slips
• Its innervation by the vagus nerve
• Its skeletal muscle tissue type
• Its location outside the thorax

Q6. Which three muscle groups represent regional parts of the deepest intrinsic thoracic wall muscle plane?

• Transversus thoracis, innermost intercostals, and subcostals
• Scalenes, latissimus dorsi, and rectus abdominis
• External intercostals, diaphragm, and trapezius
• Pectoralis major, pectoralis minor, and serratus anterior

Q7. Which relationship makes transversus thoracis an important landmark when considering the internal thoracic artery?

• The artery passes through the center of the muscle in every person
• The muscle lies closely related to the internal thoracic vessels
• The artery originates from the muscle
• The muscle forms the wall of the artery

Q8. Which nerves provide segmental motor innervation to transversus thoracis?

• Intercostal nerves
• Phrenic nerves
• Thoracic sympathetic trunks
• Recurrent laryngeal nerves

Q9. Why is transversus thoracis generally considered a minor respiratory muscle?

• It is composed entirely of smooth muscle
• Its effect on rib movement is relatively weak
• It does not attach to the thoracic wall
• It is active only during swallowing

Q10. Which description best summarizes transversus thoracis?

• A deep anterior thoracic wall muscle that weakly depresses the ribs
• A pleural muscle that directly expands the lungs
• A mediastinal smooth muscle controlling the bronchi
• A superficial posterior muscle that strongly elevates the ribs