While examining the back before a posterior chest procedure, a physician counts ribs downward from the inferior angle of the scapula. With the arms hanging at the sides, the inferior angle of the scapula overlies which rib?
- A 5th rib
- B 6th rib
- C 7th rib ✓
- D 9th rib
Correct answer: C. 7th rib
Explanation
With the arm at the side, the inferior angle of the scapula lies over the 7th rib or 7th intercostal space, corresponding roughly to the T7 vertebral level. This makes it the standard starting point for counting ribs on the back when planning a posterior thoracocentesis or identifying spine levels. The 6th rib is not marked by any reliable scapular landmark, and the 9th rib lies far below the scapular angle.
Reference: Moore's Clinically Oriented Anatomy, 9th ed.
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Written and medically reviewed by the StethoPrep medical team.