Manger Paul R, Masiello Italo, Innocenti Giorgio M
Department of Neuroscience, B2:2, Division of Neuroanatomy and Brain Development, Karolinska Institutet, Retzius väg 3, S-171 77 Stockholm, Sweden.
Cereb Cortex. 2002 Dec;12(12):1280-97. doi: 10.1093/cercor/12.12.1280.
On grounds of electrophysiological mapping, cytoarchitecture, myeloarchitecture and callosal and thalamic connectivity, we have identified two cortical areas in the posterior parietal cortex of the ferret: posterior parietal caudal and rostral (PPc and PPr). These areas occupy the lateral and suprasylvian gyri, from the cingulate sulcus (medially) to the suprasylvian sulcus (laterally) and lie between visual areas 18 and 21 (posteriorly) and the somatosensory areas (anteriorly). Within both areas a coarse representation of the visual field was found and within PPr there was also a representation of the body. Each representation mirrors those within neighboring areas. Cytoarchitectonic and myeloarchitectonic fields within this cortical region did not correspond in any simple way to the physiological representations. The architectonic differences correlate to differential callosal connectivity, with predominant connectivity corresponding to the upper hemifield/head representations. PPr and PPc receive thalamic projections from a different, but overlapping, complement of thalamic nuclei. The superimposition of somatic and visual maps in PPr might relate to the probable role of this area in transforming retinal-centered to body-centered spatial coordinates. The organization of the parietal areas in the ferret resembles that of the flying fox and might unveil a common organizational plan from which the primate posterior parietal cortex evolved.
基于电生理图谱、细胞构筑、髓鞘构筑以及胼胝体和丘脑连接性，我们在雪貂的顶叶后皮质中确定了两个皮质区域：顶叶后尾侧和嘴侧（PPc和PPr）。这些区域占据外侧回和上薛氏回，从扣带沟（内侧）到上薛氏沟（外侧），位于视觉18区和21区（后方）与体感区（前方）之间。在这两个区域内均发现了视野的粗略表征，并且在PPr内还存在身体的表征。每个表征都与相邻区域内的表征相对应。该皮质区域内的细胞构筑和髓鞘构筑区域与生理表征并无任何简单的对应关系。构筑差异与不同的胼胝体连接性相关，主要连接性对应于上半视野/头部表征。PPr和PPc从不同但重叠的丘脑核团接受丘脑投射。PPr中躯体和视觉图谱的叠加可能与该区域在将以视网膜为中心的空间坐标转换为以身体为中心的空间坐标中可能发挥的作用有关。雪貂顶叶区域的组织与狐蝠的相似，可能揭示了灵长类动物顶叶后皮质进化而来的共同组织模式。
