Dendritic spine

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prototypical dendritic spine

structure dimension source
dendrite length 6 µm
Harris Tsao 1992 [1]
dendrite diameter 1.0 µm
Harris Tsao 1992 [2]
spine total length 1.0 µm
Harris Tsao 1992 [3]
spine neck length 0.7 µm
Harris Tsao 1992 [4]
spine neck diameter 0.3 µm
Harris Tsao 1992 [5]
spine head length 0.3 µm
Harris Tsao 1992 [6]
spine head diameter 0.5 µm
Harris Tsao 1992 [7]
synaptic surface area 1.5 µm2
Harris Tsao 1992 [8]
spine total volume 0.1 µm3
Harris Tsao 1992 [9]
spine count 1/µm dendrite
Harris Tsao 1992 [10]


Spine volume calculations are based on cylindrical shape: πr2 * L

π(.3/2)2 * 0.7 + π(.5/2)2 * 0.3 = 0.1 µm3