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dendritic spine
(redirected from Dendritic spines)

   Also found in: Wikipedia 0.02 sec.
dendritic spine
n.
Any of various outgrowths of certain nerve-cell dendrites, ranging in shape from small knobs to thornlike or filamentous processes, that are preferential sites of synaptic axodendritic contact.


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The size of the dendritic arbor and the density of dendritic spines determine the total synaptic input a neuron can receive (Engert and Bonhoeffer 1999; Purves 1988) and influence the types and distribution of these inputs (Miller and Jacobs 1984; Schuman 1997; Sejnowski 1997).
When they examined the animals' brains, they found that hippocampal cells in those mice that had received ghrelin had about a quarter more dendritic spines, which are specialized nerve cell connections associated with learning.
Even in their 1-month-old mice, more than 70 percent of dendritic spines persisted for more than a month.
 
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