Department of Neurophysics, Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany.
Netherlands Institute for Neuroscience and Spinoza Center for Neuroimaging, Amsterdam, The Netherlands; Departments of Neurophysics and Neurology, Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany.
Neuroimage. 2019 Aug 15;197:707-715. doi: 10.1016/j.neuroimage.2017.09.037. Epub 2017 Sep 20.
The human neocortex is organized radially into six layers which differ in their myelination and the density and arrangement of neuronal cells. This cortical cyto- and myeloarchitecture plays a central role in the anatomical and functional neuroanatomy but is primarily accessible through invasive histology only. To overcome this limitation, several non-invasive MRI approaches have been, and are being, developed to resolve the anatomical cortical layers. As a result, recent studies on large populations and structure-function relationships at the laminar level became possible. Early proof-of-concept studies targeted conspicuous laminar structures such as the stria of Gennari in the primary visual cortex. Recent work characterized the laminar structure outside the visual cortex, investigated the relationship between laminar structure and function, and demonstrated layer-specific maturation effects. This paper reviews the methods and in-vivo MRI studies on the anatomical layers in the human cortex based on conventional and quantitative MRI (excluding diffusion imaging). A focus is on the related challenges, promises and potential future developments. The rapid development of MRI scanners, motion correction techniques, analysis methods and biophysical modeling promise to overcome the challenges of spatial resolution, precision and specificity of systematic imaging of cortical laminae.
人类新皮层呈放射状组织成六层,其髓鞘形成、神经元细胞的密度和排列方式存在差异。这种皮质细胞和髓鞘结构在解剖学和功能神经解剖学中起着核心作用,但主要只能通过侵入性组织学来研究。为了克服这一限制,已经开发并正在开发几种非侵入性 MRI 方法来解析解剖学皮层层。因此,最近在大人群和层水平的结构-功能关系方面的研究成为可能。早期的概念验证研究针对明显的层结构,如初级视觉皮层中的 Gennari 纹。最近的工作描述了视觉皮层外的层结构,研究了层结构与功能之间的关系,并证明了特定于层的成熟效应。本文综述了基于常规和定量 MRI(不包括扩散成像)的人类皮层解剖层的方法和体内 MRI 研究。重点介绍了相关的挑战、前景和潜在的未来发展。MRI 扫描仪、运动校正技术、分析方法和生物物理建模的快速发展有望克服皮层层系统成像的空间分辨率、精度和特异性方面的挑战。