Department of Psychiatry and Psychotherapy, University Medical Center, Freiburg, Germany.
Psychiatry Res. 2009 Dec 30;174(3):217-22. doi: 10.1016/j.pscychresns.2009.05.001. Epub 2009 Nov 11.
Many recent studies reported altered functional connectivity within the frontolimbic circuitry in a wide range of neuropsychiatric disorders. However, functional connectivity must rely on structural connections. In this study we applied a novel probabilistic fiber tracking method to assess the structural connectivity between the amygdala and different prefrontal brain regions in vivo. Twenty healthy subjects were investigated with diffusion tensor imaging. Probabilistic fiber tracking was started from the amygdala and different prefrontal brain regions. Resulting probability maps were combined using an extended multiplication of probabilistic maps to identify the most probable anatomical pathways connecting these structures. We found one ventral pathway through the uncinate fascicle, connecting the amygdala and the medial and lateral orbitofrontal cortices. In addition to this ventral pathway, we depicted distinct dorsal pathways (medial and lateral), which connect the amygdala with the anterior cingulate cortex and the dorsolateral prefrontal cortex. The dorso-medial pathway proceeds through the inferior thalamic peduncle, while the dorsolateral pathway travels through the external capsule. We believe that our approach provides a promising tool to assess the integrity of specific structural connections in patients with neuropsychiatric disorders.
许多最近的研究报告称,在广泛的神经精神疾病中,额 - 边缘回路的功能连接发生了改变。然而,功能连接必须依赖于结构连接。在这项研究中,我们应用了一种新的概率纤维追踪方法来评估活体杏仁核和不同前额叶脑区之间的结构连接。我们对 20 名健康受试者进行了弥散张量成像。概率纤维追踪从杏仁核和不同的前额叶脑区开始。将得到的概率图使用概率图的扩展乘法组合起来,以确定连接这些结构的最可能的解剖途径。我们发现一条通过钩束的腹侧途径,连接杏仁核和内侧和外侧眶额皮质。除了这条腹侧通路,我们还描绘了明显的背侧通路(内侧和外侧),它们将杏仁核与前扣带皮质和背外侧前额叶皮质连接起来。背侧-内侧通路通过下丘脑脚,而背外侧通路通过外囊行进。我们相信,我们的方法为评估神经精神疾病患者特定结构连接的完整性提供了一种有前途的工具。
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