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- Small protuberances, usually ~ 1µm in length, from the dendritic
shafts of some neurons specialized for receiving synaptic contacts. Spines
are frequent on the dendrites of the principal cells of most brain regions,
notably on the pyramidal cells of cerebral cortex and the Purkinje cells
of the cerebellar cortex. For these cells, more than 90% of their excitatory
synapses occur on dendritic spines. Therefore, spines may play an important
role in learning and memory.
- Adapted from Synapse Web http://synapses.mcg.edu/anatomy/dendrite/dendrite.stm
by Maryann Martone
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