Figure 1.

Schematics of skin structure and tactile receptors in hairy and hairless (glabrous) skin. (A) Skin structure including tissues and tactile receptors. This drawing includes both hairy and glabrous skins. (B) Distribution of receptive fields for an afferent fiber type (called Pacinian corpuscle [PC], rapidly adapting type II nerve fiber [RA II], and fast-adapting type II nerve fiber [FA II]) in the palm of the hand and sole of the foot (i.e., glabrous skin) [24,78,79]. Here, PC, RA II and FA II are the same but are used in a different way by different researchers.