Image Based Question-68019

Maximum sensitivity of the Clinical test shown in Photograph is exhibited in

A. Shin

B. Toes

C. Finger pads

D. Soles

Correct Answer » C Explanation

Ans:C. Finger pads

(Test shown:Two-point discrimination test)

Two-point discrimination

• It is the ability to discern that two nearby objects touching the skin are truly two distinct points, not one.

• Normal and Impaired Performance:

• Body areas differ both in tactile receptor density and somatosensory cortical representation.

• Normally, a person should be able to recognize two points separated by 2 to 8 mm on fingertips.

• On the lips, it is 2 to 4 mm, and on the palms, it is 8 to 12 mm and 30–40 mm on the shins or back.

• The posterior column-medial lemniscus pathway is responsible for carrying information involving fine, discriminative touch.

• Therefore, two-point discrimination can be impaired by damage to this pathway or to a peripheral nerve.