What question did this study set out to answer?

To determine the relative and absolute densities of four distinct mechanoreceptive unit types across the glabrous skin of the human hand.

January 1, 1979The Journal of PhysiologyOpen Access

Tactile sensibility in the human hand: relative and absolute densities of four types of mechanoreceptive units in glabrous skin.

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To determine the relative and absolute densities of four distinct mechanoreceptive unit types across the glabrous skin of the human hand.
Recorded single-unit nerve impulses percutaneously using tungsten needle electrodes in the median nerve of conscious human subjects (N=334 low-threshold mechanoreceptive units).
Classified units into rapidly adapting (RA, PC) and slowly adapting (SA I, SA II) groups based on adaptation dynamics and receptive field boundaries.
Calculated spatial densities across palm, finger, and fingertip regions, establishing an absolute density model based on myelinated fiber counts.
Overall mechanoreceptor density increased proximo-distally, exhibiting relative densities of 1.0 in the palm, 1.6 across the finger, and 4.2 at the fingertip.
The distal density gradient was driven exclusively by RA and SA I units with small, well-defined receptive fields, whereas PC and SA II units were uniformly distributed.
Absolute mechanoreceptive unit density was modeled at 241 units/cm² at the fingertip compared to 58 units/cm² in the palm.

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Implication

Electrophysiological study uncovers a marked distal gradient of mechanoreceptor density in human hand skin, indicating that RA and SA I units govern high fingertip tactile acuity.

Cite This Study

Johansson et al. (1979) studied this question.

synapsesocial.com/papers/69d88f658c03fbaff8bef68d https://doi.org/10.1113/jphysiol.1979.sp012619

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Implication

Electrophysiological study uncovers a marked distal gradient of mechanoreceptor density in human hand skin, indicating that RA and SA I units govern high fingertip tactile acuity.

Tactile sensibility in the human hand: relative and absolute densities of four types of mechanoreceptive units in glabrous skin.

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Discussion

Implication

Cite This Study

Tactile sensibility in the human hand: relative and absolute densities of four types of mechanoreceptive units in glabrous skin.

Key Points

Discussion

Implication

Cite This Study

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