Fingerprint Flashcards
This refers to the
points of the tails in the formation of the pattern.
Ridge Characteristics
Is a kind
of ridge formation that curves
back in the direction from which it started. Sometimes referred as looping ridge.
RECURVING RIDGE
Are two ridges running side by side and suddenly separating, one ridge going one way and the other ridge going another way.
DIVERGING RIDGE-
Is a single ridge which splits into two ridges forming a Y shape structure.
BIFURCATION OR
BIFURCATING RIDGE
Two or more lines forming an angle.A ridge whose close end is
angular and serve as a point of
convergence pointed and
abrupt.
CONVERGING RIDGE -
The point at which one ridge
divides into three ridges
Trifurcation
A single friction ridge that
terminates within the
friction ridge structure.
ENDING RIDGE
A point where two ridge units
intersect.
Ridge Crossing
A short ridge on top or summit
of a recurving ridge usually at
right angle.
APPENDAGE
Is a single ridge in the center of a recurving ridge of a loop pattern.
ROD OR BAR
a single recurving ridge enclosing one or more rods or bars.
ENVELOP
Is a
bifurcation which does not
remain open but which the leg of the bifurcation, after running along side by side for a short
distance, came together again
to form a single ridge once
more.
ENCLOSURE
Fragmentary ridges formed by a dot or series of dots, which
resembles appoint.
Dot or series of dots
bifurcation with one
short ridge branching off a
longer ridge
Spurs
Fragmentary ridges formed by short or series of short ridges.
SHORT or SERIES OF SHORT RIDGES
connecting friction ridge
between parallel running ridges,
generally right angles.
BRIDGES
Is a part of fingerprint which lies within the area surrounded by the type
lines.
PATTERN AREA
These are basic boundaries of all fingerprint
patterns. They are formed with ridges which run parallel, then diverge or separate tending to surround the pattern area.
TYPELINES
unusual type of ridges found in small percentage of patterns; short,
narrow and badly formed ridges found between two well-formed and full-bodied ridges.
Incipient ridges -
depressions or canals between
the ridges, which maybe
compared with the low area in a
tire thread.
Furrows
is that point on a ridge at or nearest the point of divergence of two typelines, and located at or
directly in front of the point of
divergence.
Delta
The approximate center of the upon or within the innermost sufficient recurve. It may be located on the shoulders of the innermost loop farthest from the delta.
CORE
is that point on a ridge at or nearest the point of divergence of two typelines, and located at or
directly in front of the point of
divergence.
Delta
Rules governing the selection of delta
Rule 1
The delta may not be located at a bifurcation which does not open toward the core.
Rule 2
When there is a choice between a
bifurcation and another type of delta,
the bifurcation is selected.
Rule 3
When there are two or more possible
deltas which conform to the
definition, the
one nearest the core is
chosen.
Rule 4
The delta may not be located
in the middle of a ridge running between the type lines toward the core, but at the nearer end only.