Encyclopedia > Dendrite

  Article Content

Dendrite

In biology, a dendrite is a slender, typically branched projection of a nerve cell or neuron, which conducts the electrical stimulation received from other cells through synapses to the body or soma of the cell from which it projects.

Many dendrites convey this stimulation passively, meaning without action potentials and without activation of voltage-gated ion channels. In such dendrites the voltage change that results from stimulation at a synapse may extend both towards and away from the soma. In other dendrites, though an action potential may not arise, nevertheless voltage-gated channels help to propagate excitatory synaptic stimulation. This propagation is efficient only toward the soma due to an uneven distribution of channels along such dendrites.

The structure and branching of a neuron's dendrites strongly influences how it integrates the input from many others, particularly those that input only weakly (more at synapse). This integration is in aspects "temporal"--involving the summation of stimuli that arrive in rapid succession--as well as "spatial"--entailing the aggregation of excitatory and inhibitory inputs from separate branches or "arbors."

Compare axon


In chemistry, a dendrite is a crystal that branches into two parts during growth.



All Wikipedia text is available under the terms of the GNU Free Documentation License

 
  Search Encyclopedia

Search over one million articles, find something about almost anything!
 
 
  
  Featured Article
242

... Contents 242 Centuries: 2nd century - 3rd century - 4th century Decades: 190s 200s 210s 220s 230s - 240s - 250s 260s 270s 280s 290s Years: 237 238 239 240 ...

 
 
 
This page was created in 24.7 ms