title: Development of laminar organization of the fetal cerebrum at 3.0T and 7.0T: a postmortem MRI study.
abstract: BACKGROUND
  The purpose of this study is to show the condition of laminar organization on 3.0T and 7.0T postmortem magnetic resonance imaging (MRI) and analyze developmental changes.
  
  
  METHODS
  Heads of 131 fetal specimens of 14-40 weeks gestational age (GA) were scanned by 3.0T MRI. Eleven fetal specimens of 14-27 weeks GA were scanned by 7.0T MRI. Clear images were chosen for analysis.
  
  
  RESULTS
  On T₁-weighted 3.0T MRI, layers could be visualized at 14 weeks GA and appeared clearer after 18 weeks GA. On 7.0T MRI, four zones could be recognized at 14 weeks GA. During 15-22 weeks GA, when laminar organization appeared typical, seven layers including the periventricular zone and external capsule fibers could be differentiated, which corresponded to seven zones in histological stained sections. At 23-28 weeks GA, laminar organization appeared less typical, and borderlines among them appeared obscured. After 30 weeks GA, it disappeared and turned into mature-like structures. The developing lamination appeared the most distinguishable at the parieto-occipital part of brain and peripheral regions of the hippocampus. The migrating thalamocortical afferents were probably delineated as a high signal layer located at the lower, middle, and upper part of the subplate zone at 16-28 weeks GA on T₁-weighted 3.0T MRI.
  
  
  CONCLUSIONS
  T₁-weighted 3.0T MRI and T₂-weighted 7.0T MRI can well demonstrate the laminar organization. Development of the lamination follows a specific spatio-temporal regularity, and postmortem MRI of the parieto-occipital part of brain obtained with 3.0T or 7.0T is an effective way to show developmental changes.
authors.affiliation: Research Center for Sectional and Imaging Anatomy, Shandong University School of Medicine, 44 Wen-hua Xi Road, Jinan, Shandong Province 250012, China.
authors.forename: Zhonghe
authors.initials: Z
authors.lastname: Zhang
authors.forename: Shuwei
authors.initials: S
authors.lastname: Liu
authors.forename: Xiangtao
authors.initials: X
authors.lastname: Lin
authors.forename: Gaojun
authors.initials: G
authors.lastname: Teng
authors.forename: Taifei
authors.initials: T
authors.lastname: Yu
authors.forename: Fang
authors.initials: F
authors.lastname: Fang
authors.forename: Fengchao
authors.initials: F
authors.lastname: Zang
mesh_terms: D000375:Aging / Q000473:pathology / Q000502:physiology*; D002540:Cerebral Cortex / Q000033:anatomy & histology / Q000196:embryology* / Q000254:growth & development*; D003933:Diagnosis; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008953:Models, Anatomic