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Gross neuroanatomy measures &introduction to variability
References
• Steinmetz H., Furst, G., Freund, H., “Cerebral Cortical Localization: application and validation of the proportional grid system in MR Imaging”, 1989, Journal of Computer Assisted Tomography, 13(1):10-19
• Ono M., Kubik S., Abernathey C.D., Atlas of the cerebral sulci, 1990, Thieme Verlag
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Talairach transformation&
variability range of main sulci
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Method• Tomographic images are collected on 30 hemispheres of 15 people
(22-63 yo)
• Talairach transformation is performed using 4 AC PC and 5 extreme landmarks
• Sulci are identified manually and projected sagitally
Align extreme pointsShift AC PC vertically and side-to-side
AC
PC AC
PC
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Central Sulcus 20 hemispheres
Sylvian Fissure (R) 15 hemispheres
Sylvian Fissure (L) 15 hemispheres
Calossal, Parietooccipital, Marginal sulci, 30 hemispheres
Leftover variability after Talairach transformation
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Summary
• Central sulcus (CS) in the postmortem Talairach brain is located 0.5-1.0 cm anterior to the CS in the 30 hemispheres studied here
• 2-3 cm displacement is observed in most of the studied major sulci
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Incidence rates of main sulci
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Method
• 25 postmortem brains
• Length determined by running a chord inside sulci
• Molded silicon models are developed to study internals of the sulci
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Statistics
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Statistics