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How big is a human nerve cell?

Updated: 8/10/2023
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15y ago

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Diameters, area, and form of the optic nerve scleral canal were measured in 107 freshly enucleated, unfixed, human donor eyes. Macrophotographs of the sectioned posterior fundus pole were provided with a millimeter scale and evaluated planimetrically. They revealed a surprising variation: area: 2.59 ± 0.72 mm2 (minimum 0.68 mm2, maximum 4.42 mm2); minimal diameter: 1.67 ± 0.72 mm; maximal diameter: 1.92 ± 0.32 mm. The mean form factor was 0.92 ± 0.11 and the quotient of minimal to maximal diameter 0.86 ± 0.11, indicating a slightly oval nearly round form. The coefficients of variation of the method's reproducibility were 0.005 for intraobserver and 0.02 for interobserver determination. The size values of these optic nerve scleral canals were not significantly (Wilcoxon-Mann-Whitney test) different from than those of 100 unselected optic discs that had been determined intravitally using Littmann's method. This indicates the reliability of Littmann's method for the intravital measurement of the optic nerve head in absolute dimensions.

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13y ago
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15y ago

The soma (body) of a neuron can be from about 5 to 100 micrometers in diameter(wikipedia). If you include the dendrites and axons sizes can be even more variable. For example there is a single nerve cell which runs from the bottom of your spinal cord to your toes.

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11y ago

There are two ways of measuring the human nervous system. In terms of its spatial measurement, it extends to every part of the body, so it is as large as a human body. In terms of mass, it adds up to about 3 pounds.

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11y ago

it is about 4 microns to 100 microns in diameter

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13y ago

Diameter = 0.001mm to 1mm and length = fraction of a inch to several feet

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13y ago

Smaller than the tip of a push pin. You could probably fit well over 20 on the tip of one push pin.

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14y ago

cells are microscopic

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