Intermediate Intercostal Muscles Quiz

Q1. In which direction do external intercostal muscle fibers generally run?

• Vertically
• Inferoanteriorly
• Inferoposteriorly
• Horizontally

Q2. In which direction do internal intercostal muscle fibers generally run?

• Vertically
• Transversely
• Inferoposteriorly
• Inferoanteriorly

Q3. Where are external intercostal muscles replaced by membranes anteriorly?

• At the diaphragm
• Near the costochondral junctions
• At the vertebral bodies
• At the lung hila

Q4. Where are internal intercostal muscles replaced by membranes posteriorly?

• Near the rib angles
• Near the sternum
• At the xiphoid process
• At the lung apex

Q5. Between which muscle layers does the main intercostal neurovascular bundle run?

• External intercostals and skin
• Innermost intercostals and pleura only
• Internal and innermost intercostals
• External and internal intercostals

Q6. Where does the main intercostal neurovascular bundle usually course?

• Pleural cavity
• Costal groove of the rib above
• Center of the sternum
• Superior border of the rib above

Q7. What is the usual superior to inferior order of the main intercostal neurovascular bundle?

• Artery, nerve, vein
• Nerve, artery, vein
• Vein, artery, nerve
• Vein, nerve, artery

Q8. Which part of the internal intercostal muscles mainly depresses the ribs?

• External membrane
• Costal pleura
• Interosseous part
• Interchondral part

Q9. Which part of the internal intercostals can assist rib elevation?

• Subcostal part
• Interosseous part
• Interchondral part
• Internal intercostal membrane

Q10. What is an important mechanical role of all intercostal muscle layers?

• Close the trachea during swallowing
• Stabilize the intercostal spaces
• Open the pulmonary valves
• Contract the visceral pleura