The imaginary line or plane running along the back of an organism along its midline, dividing it into equal left and right halves.
From Latin dorsum (back) + meson (middle). In anatomy, meson refers to the median plane; this term specifically names the median line as it runs along the dorsal surface. Used primarily in comparative anatomy and zoology.
Imagine drawing a pencil line down the exact middle of a creature's back from head to tail—that's the dorsimeson, and it's the reference line anatomists use when describing whether something is to the left or right of center on the dorsal side!
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