Deep cortical layers are activated directly by thalamus.

Deep cortical layers are activated directly by thalamus.
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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:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Bruno RM
Bruno RM
中科院分区:
其他
文献类型:
--
作者:
Constantinople CM;Bruno RM

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丘脑皮质向第4层(L4)的投射被认为是感觉器官与皮质通讯的主要途径。据信,感觉信息然后沿着L4→L2/3→L5/6通路沿着皮质柱传播。我们发现,L5/6神经元的感觉诱发反应,而不是来自直接丘脑皮层突触。许多L5/6神经元表现出与L4相同的潜伏期的感觉诱发突触后电位。从L5/6神经元和丘脑神经元的配对在体内记录显示显着的收敛直接丘脑皮质突触到不同类型的颗粒下神经元,特别是在L5 B。L4的药理学失活对L5/6神经元的感觉诱发突触输入没有影响。因此,L4不是皮质活动的强制性分布中心,丘脑平行激活两个单独的、独立的皮质“层”。
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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