Tenprint Fingerprint Certification Tenprint Fingerprint Ridge Detail & Pattern Types 2

Question 1

What is the 'type line' in fingerprint pattern analysis?

Accepted Answer

The two innermost ridges that parallel, diverge, and surround the pattern area

Answer

Type lines are the two innermost ridges that run roughly parallel, then diverge to enclose or surround the fingerprint pattern area.

Question 2

How is the ridge count determined for a loop pattern?

Accepted Answer

Count ridges crossing an imaginary line from the core to the delta, not counting the core or delta ridges themselves

Answer

The ridge count is determined by counting ridges crossing an imaginary line drawn from the core to the delta, excluding both the core and the delta.

Question 3

What is the 'core' of a fingerprint pattern?

Accepted Answer

The approximate center of the fingerprint pattern, used as a reference point

Answer

The core is the approximate center of the fingerprint pattern and is used, along with the delta, as a reference point for ridge counting and tracing.

Question 4

Which pattern type has no deltas and no recurving ridges?

Accepted Answer

Plain Arch

Answer

A plain arch has no deltas and no recurving ridges — ridges flow smoothly from one side of the finger to the other in a wave shape.

Question 5

What is a 'short ridge' in ridge detail analysis?

Accepted Answer

A ridge that begins and ends without connecting to other ridges, shorter than a normal ridge

Answer

A short ridge (also called an independent ridge) begins and terminates without connecting to other ridges and is shorter than the surrounding ridges.

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