Intermediate Subcostal Muscles Quiz
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This quiz contains 10 questions. Click below to begin.
Q1. Near which part of a rib do subcostal muscles typically arise?
- At the costochondral junction only
- At the xiphoid process
- At the head of the sternum
- Near the rib angle
Q2. How do subcostal muscles differ from typical intercostal muscles in their attachments?
- They may span more than one intercostal space
- They attach directly to the lungs
- They attach only to the sternum
- They never attach to ribs
Q3. A subcostal muscle commonly inserts on which rib?
- The immediately superior rib only
- A rib two or three levels below
- The clavicle
- The first rib only
Q4. Which general direction do subcostal muscle fibers follow?
- Inferomedially
- Superolaterally only
- Directly vertically
- Directly horizontally
Q5. Which intercostal muscle layer is most similar functionally to the subcostal muscles?
- Pectoralis major
- Serratus anterior
- External intercostal muscles
- Internal intercostal muscles
Q6. Which deep thoracic wall muscle is located anteriorly rather than posteriorly?
- Subcostal muscle
- Latissimus dorsi
- Transversus thoracis
- External intercostal
Q7. Subcostal muscles are considered part of which thoracic muscle plane?
- Mediastinal muscle plane
- Superficial back muscle plane
- Superficial pectoral plane
- Deepest thoracic wall muscle plane
Q8. Which muscle is the lateral component of the deepest intercostal muscle plane?
- Serratus posterior superior
- Innermost intercostals
- Pectoralis minor
- External intercostals
Q9. Which structure separates the deepest thoracic wall musculature from the parietal pleura?
- Endothoracic fascia
- Fibrous pericardium
- Superficial fascia
- Visceral pleura
Q10. Which statement best distinguishes subcostal muscles from innermost intercostal muscles?
- Subcostals are smooth muscles
- Subcostals are located outside the thoracic wall
- Subcostals commonly span multiple ribs posteriorly
- Subcostals receive phrenic nerve innervation