A woman with severe visual and auditory deficits is able to identify individuals by running her fingers lightly over their face. Which of the following sources is most likely to provide the input that allows for the woman's unique ability?
A)
Pacinian corpuscles
B)
Ruffini end organs
C)
Meissner corpuscles
D)
Free nerve endings
Ans:
C
Feedback:
Meissner corpuscles, which are present on the hair-free areas like palms and fingers, are responsible for fine tactile sensation. Pacinian corpuscles provide input on vibration, while Ruffini end organs exist in deeper structures that signal continuous states of deformation. Free nerve endings also detect touch and pressure, but not to the highly differentiated degree of Meissner corpuscles.
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