The oblique fissure of the lung is posteriorly related to which rib level?

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Multiple Choice

The oblique fissure of the lung is posteriorly related to which rib level?

Explanation:
The oblique fissure is a diagonal groove that separates lobes and its relationship to the chest wall can be traced along a specific rib level on the back. Posteriorly, it lies opposite the fourth rib. In its course, the fissure starts near the spinous process of the second thoracic vertebra and descends forward, finishing at the front around the sixth costal cartilage, so the common posterior reference point on the back is the fourth rib. This is why the fourth rib is the rib level associated with the posterior relation of the oblique fissure. Other rib levels would not align with the known posterior course of this fissure.

The oblique fissure is a diagonal groove that separates lobes and its relationship to the chest wall can be traced along a specific rib level on the back. Posteriorly, it lies opposite the fourth rib. In its course, the fissure starts near the spinous process of the second thoracic vertebra and descends forward, finishing at the front around the sixth costal cartilage, so the common posterior reference point on the back is the fourth rib. This is why the fourth rib is the rib level associated with the posterior relation of the oblique fissure. Other rib levels would not align with the known posterior course of this fissure.

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