: Which part of the body has the most nerve receptors? I am studying a non-medical field so please bear with me. Which part of the flat skin has the most nerve receptors? I plan to build a grid of vibrators.

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The largest organ in your body does -- the skin.

The most sensitive area would be any distal (meaning the farthest away) extremities. Areas that require fine control (such as dexterity). Your finger tips or genitals would be #1 .

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If you want to build a vibrator, you need to look for erogenous zones, not just sensitive zones

An erogenous zone (from Greek ????, ér?s "love" and English -genous "producing" from Greek -?????, -gen?s "born") is an area of the human body that has heightened sensitivity, the stimulation of which may generate a sexual response, such as relaxation, the production of sexual fantasies, sexual arousal and orgasm.
Wikipedia.Org

This article gives a good overview:

There are two types of erogenous zones: nonspecific and specific. Those of the nonspecific type depend upon exaggeration of a basic tickle sensation. Specific erogenous zones, the mucocutaneous zones of human and animal, have special neural and cutaneous anatomic characteristics. The mucocutaneous end-organs in any given species appear to be identical in all of the the zones. The endings of the primates are markedly different from those of lower animals. Development of the nerve endings is principally postfetal and may coincide with the organization of oral, anal and genital patterns of behavior.
Winkelmann, RK. (1959). "Erogenous zones: their nerve supply and significance". Mayo Clin Proc. 34 (2): 39–47.

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If we are talking about Tactile corpuscle or Meissner's corpuscles and Lamellar corpuscle it would be the fingertips followed by lips.
I did not find a reference in English, only a German:

Die Fingerspitzen weisen die höchste Rezeptorendichte auf. Damit wird Begreifen möglich.
Lang, Phillip, Lang, Florian: Basiswissen Physiology, Springer-Verlag, 2007; Seite 376
The fingertips have the highest density of receptors. This is why grasping is possible.
Translation into English

The all over highest density in receptors can be found in the Fovea centralis.