Abstract
The morphology and function of sensory receptors in the glabrous skin of vertebrates are described. The fundamental characteristics of these receptors are conserved across vertebrate orders, which suggests that they appeared early in vertebrate evolution to sense basic environmental stimuli of universal importance. The specialization and location of certain receptors in the glabrous skin tends to be associated with the evolution of modified dermal structures that are used to detect and evaluate food objects. Selection for specialized foraging behaviors and corresponding sensory receptors also favored the relative expansion of the somatosensory cortex, a trend that is evident across mammals, including humans.
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