A two dimensional anatomical entity that does not correspond to any physical discontinuity.

This is just here as a test because I lose it

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Fiat anatomical boundaries are generally defined using external physical criteria as landmarks. One might argue that all boundaries are actually fiat in the sense that there must be some fiat element at a fine enough scale of granularity. This ontology choses to ignore this issue as below the level of granularity relevant to anatomy. (DOS121102)