- Loops - To
increase specificity, the direction that the loop opens refers to the
major bones of the forearm, the radius and the ulna. If a
loop on a finger opens in the direction of the thumb, it is a radial
loop. If it opens towards the little finger, it is ulnar loop.
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- Arches-There are
two types of arches: plain and tented arch. The tented arch's
ridges have a nearly vertical slope, whereas plain arches have
more gently sloping ridges.
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- Whorls-There
are four types of whorl patterns: plain, double loop, central pocket
loop, and accidental. The plain whorl has many circular ridges and
looks somewhat like a pond after a pebble has been dropped in it. A
central pocket loop looks somewhat like a loop print with a small whorl
in the middle. A double contains two overlapping loops that open in
opposite directions. An Accidental whorl is the catchall for patterns
that don't fit any of the others or that are made up of two types of
other patterns.
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