Oar is utilized for water propulsion in manual boating. They have a flat end on one side. One of the causes of anterior ribs widening or oar-shaped vertebrae seen primarily in cases of Hurler disease.
Case Discussion
Image credit: Motmit
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Original file: https://en.wikipedia.org/wiki/Oar#/media/File:OarCollection01.JPG
Modifications: square crop
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