Advanced Intercostal Muscles Quiz
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This quiz contains 10 questions. Click below to begin.
Q1. From where to where does an external intercostal muscle extend within an intercostal space?
- Costal cartilage directly to diaphragm
- Sternum directly to vertebral body
- Superior border above to inferior border below
- Inferior border above to superior border below
Q2. How far anteriorly do the muscular portions of the external intercostals extend?
- Only to the midaxillary line
- Only to the rib angle
- To the anterior median line
- To the costochondral junction
Q3. How far posteriorly do the muscular portions of the internal intercostals extend?
- Only to the midclavicular line
- To the rib angles
- Into the vertebral canal
- Only to the anterior axillary line
Q4. Which plane contains the main intercostal neurovascular bundle?
- Between parietal and visceral pleura
- Between internal and innermost intercostals
- Between external and internal intercostals
- Between skin and external intercostals
Q5. Which component lies lowest in the main intercostal neurovascular bundle?
- Intercostal vein
- Thoracic duct
- Intercostal artery
- Intercostal nerve
Q6. Why is a needle commonly introduced near the superior border of a rib during thoracic procedures?
- To enter the pulmonary artery directly
- To avoid the phrenic nerve in every space
- To reduce injury to the main neurovascular bundle
- To avoid the thoracic duct in every space
Q7. Which muscles are separated from the internal intercostals by the intercostal neurovascular plane?
- Pectoralis major
- External intercostals
- Innermost intercostals
- Serratus posterior superior
Q8. Which intercostal muscle layer has fibers oriented approximately perpendicular to external intercostal fibers?
- Serratus anterior
- Transversus thoracis
- Diaphragm
- Internal intercostals
Q9. Why do the intercostal muscles remain important even during relatively quiet respiration?
- They regulate pulmonary valve closure
- They open the tracheal bifurcation
- They generate pulmonary surfactant
- They help stabilize the intercostal spaces
Q10. Which description best summarizes the intercostal muscles?
- Mediastinal muscles that control cardiac contraction
- Pulmonary muscles that directly expand alveoli
- Abdominal muscles that close the thoracic inlet
- Layered thoracic muscles that stabilize spaces and assist breathing