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lung fissures (anatomy)

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The lung fissures are divisions from the surface to the hila of lung tissue which divide it into lobes. They include the:

  • oblique fissures on both sides
  • the horizontal fissure on the right

The oblique fissure divides the left lung into superior and inferior lobes. On the right, the oblique fissure demarcates along a similar route, but the presence of the horizontal fissure results in the following arrangement:

  • superior lobe rests superior to oblique and horizontal fissures
  • middle lobe rests superior to oblique fissure but inferior to horizontal fissures
  • lower lobe rests inferior to oblique fissure

In a significant proportion of the population, the fissures are incomplete and the lobes merge. Conversely, a minority display accessory lobes due to the creation of new fissures e.g. the meso-azygous fissure.

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