Deep cortical layers are activated directly by thalamus.
Deep cortical layers are activated directly by thalamus.
复制标题
深层皮层被丘脑直接激活。
DOI:
10.1126/science.1236425
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发表时间:
2013-06-28
期刊:
影响因子:
--
通讯作者:
Bruno RM
中科院分区:
文献类型:
--
作者:
Constantinople CM;Bruno RM
The thalamocortical projection to layer 4 (L4) is thought to be the main route by which sensory organs communicate with cortex. Sensory information is believed to then propagate through the cortical column along the L4→L2/3→L5/6 pathway. We discovered that sensory-evoked responses of L5/6 neurons derive instead from direct thalamocortical synapses. Many L5/6 neurons exhibited sensory-evoked post-synaptic potentials with the same latencies as L4. Paired in vivo recordings from L5/6 neurons and thalamic neurons revealed significant convergence of direct thalamocortical synapses onto diverse types of infragranular neurons, particularly in L5B. Pharmacological inactivation of L4 had no effect on sensory-evoked synaptic input to L5/6 neurons. L4 is thus not an obligatory distribution hub for cortical activity, and thalamus activates two separate, independent “strata” of cortex in parallel.
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