F. Two-point Discrimination Test Using calipers, test the ability of the subject to differentiate two distinct sensations when the skin is touched simultaneously at two points. If calipers are not available, use two blunt probes (or forceps) and a metric ruler. Start with the points right together, then gradually increase the distance apart. Record the distance at which the subject first reports feeling two distinct points of contact with the skin (the two-point threshold). Test the areas of the body as listed in the chart below. Body area Two-point threshold (mm) Palm of hand Face Back of hand Fingertips Lips Back of neck of calf 1. Of the tested areas of the body, which ones seem to have the greatest density of receptors (smallest two-point threshold)? a. Palm of the hand c. Fingertips d. Lips e. Back of neck f. Back of calf b. Face back of hand 2. Which have the least receptor cells? a. Palm of the hand e. Back of neck c. Fingertips d. Lips b. Face back of hand f. Back of calf

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