People often talk about how many bones there are in your feet: 26 bones in each foot, 25% of your bodyâs bones are found in your feet, etc., etc. But your foot isnât just a bag of bonesâthere are muscles in those feet, and they can get injured, too. For example, thereâs your abductor hallucis muscle.he abductor hallucis muscle! This nifty little muscle starts at your calcaneous, or heel bone, runs along the arch, and then slides into the side of your big toe. It helps you move and flex your big toe, and holds up the arch of your foot.
Datum definition, a single piece of information, as a fact, statistic, or code; an item of data. See more.
More broadly, a vertical datum is the entire system of the zero elevation surface and methods of determining heights relative to that surface.Over the years, many different types of vertical datums have been used. The most predominant types today are tidal datums and geodetic datums. . Each of these datums has either a single datum origin point, otherwise known as a primary bench mark, or one such point per island in its coverage area. Every datum origin point in these five datums is at a tide gage.