Dendritic spine

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prototypical dendritic spine

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