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.
A reference datum (mathematical model) is a known and constant surface which is used to describe the location of unknown points on the earth. Since reference datums can have different radii and different center points, a specific point on the earth can have substantially different coordinates depending on the datum used to make the measurement.