Two-point discrimination
While two-point discrimination is more sensitive and ought to be used often in diagnosing finger injuries, light touch is an effective screening test. In the O'Riain wrinkle test, the finger is submerged in warm water while being watched for signs of digital pulp wrinkles.
The nerve is intact if there is wrinkleing. The two-point discrimination test is used to determine a patient's capacity to recognize two nearby spots on a tiny patch of skin and the degree of that ability.
It is a gauge of tactile agnosia, or the inability to distinguish between these two sites despite having normal proprioception and cutaneous feeling.
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