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Mnemonic: 2-4-6-8-10-12
1. Start - the pleura begin 1" above the mid-point of the medial 1/3 of the clavicle.
2. 2nd rib - both pleural lines pass down and meet at rib 2.
3. 4th rib - the pleural lines diverge from each other at rib 4, more on the left to accomodate the heart.
4. 6th rib - the edge of the right pleura is parasternal at rib 6, but the left pleura has moved away to accomodate the heart.
5. 8th rib - both right and left pleural lines pass midclavicular line (MCL) by rib 8.
6. 10th rib - both right and left pleural lines pass midaxillary line (MAL) by rib 10.
7. 12th rib - both pleural lines pass around posteriorly, so that on each side, the pleural cavity extends ~1cm below the posterior end of the 12th rib.


1. Mcminn. (2003). Last's Anatomy. Elsevier Australia. ISBN:0729537528. Read it at Google Books - Find it at Amazon
2. Netter, F. H. (2019). Atlas of human anatomy. Philadelphia, PA: Elsevier.
3. Image: no reference available.

Ⓒ A. Manickam 2018

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