title: MR appearance of the internal architecture of Ammon's horn.
abstract: OBJECTIVE
  To determine whether the four subdivisions of Ammon's horn and six layers of CA1 seen histologically can be demonstrated with MR imaging.
  
  
  METHODS
  Specimens of cadaver brains were imaged in a 3.0-T MR imager with a 3.0-cm solenoid coil. The specimens were sectioned, stained, and examined histologically. On anatomic sections, the four subdivisions of Ammon's horn and six layers of CA1 were identified. The MR images were then compared with the anatomic sections.
  
  
  RESULTS
  Using geographic characteristics, we identified the four subdivisions of Ammon's horn. In CA1, the six layers could be identified by variations in signal intensity, width, and location.
  
  
  CONCLUSIONS
  This study suggests that, with MR imaging of sufficiently high resolution, the internal architecture of Ammon's horn may be identified.
authors.affiliation: Department of Radiology, Medical College of Wisconsin, Milwaukee 53266, USA.
authors.forename: M J
authors.initials: MJ
authors.lastname: Miller
authors.forename: L P
authors.initials: LP
authors.lastname: Mark
authors.forename: K C
authors.initials: KC
authors.lastname: Ho
authors.forename: V M
authors.initials: VM
authors.lastname: Haughton
mesh_terms: D001931:Brain Mapping; D006624:Hippocampus / Q000033:anatomy & histology*; D006801:Humans; D008279:Magnetic Resonance Imaging; D009412:Nerve Fibers / Q000648:ultrastructure; D009474:Neurons / Q000648:ultrastructure; D012016:Reference Values