Question:medium
The surface marking of the oblique fissure of the lung includes all of the following except:
The surface marking of the oblique fissure of the lung includes all of the following except:
Show Hint
The fissure ends anteriorly at the 6th costal cartilage, not lower.
Updated On: Jun 24, 2026
- T3 spine
- 5th rib
- 7th rib
- 6th costal cartilage
Show Solution
The Correct Option is C
Solution and Explanation
Step 1: Recall the three points. To project the oblique fissure onto the chest wall, surface anatomy uses a curved line connecting: the level of the T3 vertebral spine posteriorly (about 8 cm lateral to it), the 5th rib where it crosses the midaxillary line, and the 6th costal cartilage anteriorly roughly 7.5 cm from the midline.
Step 2: Match the choices. Going through the options, the T3 reference, the 5th rib, and the 6th costal cartilage each correspond directly to one of these three landmarks, confirming they are genuine parts of the marking.
Step 3: Spot the outlier. The 7th rib has no role in the oblique fissure line. The fissure ends anteriorly at the 6th costal cartilage, not at the 7th rib, so this option does not fit.
Step 4: Final pick. Since every other option is a true landmark and the 7th rib is not, the 7th rib is the exception.
\[\boxed{\text{7th rib}}\]
Step 2: Match the choices. Going through the options, the T3 reference, the 5th rib, and the 6th costal cartilage each correspond directly to one of these three landmarks, confirming they are genuine parts of the marking.
Step 3: Spot the outlier. The 7th rib has no role in the oblique fissure line. The fissure ends anteriorly at the 6th costal cartilage, not at the 7th rib, so this option does not fit.
Step 4: Final pick. Since every other option is a true landmark and the 7th rib is not, the 7th rib is the exception.
\[\boxed{\text{7th rib}}\]
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