Intermediate Thoracic Muscles Quiz

Q1. Which sequence correctly lists the intercostal muscle layers from superficial to deep?

• External, internal, innermost
• Internal, external, innermost
• Innermost, internal, external
• External, innermost, internal

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

• Directly horizontally
• Directly vertically
• Inferoposteriorly
• Inferoanteriorly

Q3. In which direction do internal intercostal muscle fibers generally run?

• Inferoanteriorly
• Directly horizontally
• Directly vertically
• Inferoposteriorly

Q4. Between which muscle layers does the main intercostal neurovascular bundle travel?

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

Q5. What is the usual superior to inferior arrangement of the main intercostal neurovascular bundle?

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

Q6. Which part of the internal intercostal muscles generally depresses the ribs?

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

Q7. Which part of the internal intercostals can assist elevation of the ribs?

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

Q8. Which deep thoracic muscles commonly span more than one intercostal space?

• Subcostal muscles
• External intercostals
• Pectoralis minor
• Internal intercostals

Q9. From where does transversus thoracis extend toward the costal cartilages?

• Lateral border of the scapula
• Posterior surface of the sternum
• Superior surface of the clavicle
• Anterior surfaces of thoracic vertebrae

Q10. Which fascia separates the deepest thoracic wall muscles from the parietal pleura?

• Pretracheal fascia
• Endothoracic fascia
• Thoracolumbar fascia
• Superficial fascia