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Brain (Yakovlevian) torque direction is associated with volume asymmetry of the intracranial transverse sinuses: evidence from situs inversus totalis.
Brain Struct Funct
July 2024
Department of Experimental-Clinical and Health Psychology, Ghent University, Ghent, Belgium.
Previous research reported reversal of the prototypical brain torque in individuals with mirrored visceral topology (situs inversus totalis, SIT). Here, we investigate if typical asymmetry of the posterior intracranial venous system is also reversed in SIT and whether the direction and magnitude of this asymmetry is related to the direction and magnitude of the brain torque. Brain structural MRI images of 38 participants with SIT were compared with those of 38 matched control participants.
View Article and Find Full Text PDFYakovlevian Torque: Something Old and Something New.
Biol Psychiatry
April 2022
Department of Psychiatry and Biobehavioral Sciences, David Geffen School of Medicine at the University of California Los Angeles, Los Angeles, California; Department of Psychology, University of California Los Angeles College of Letters and Science, Los Angeles, California. Electronic address:
Structural asymmetries in normal brain anatomy: A brief overview.
Ann Anat
April 2022
Division of Neuroimaging and Neurointervention, and Stanford Initiative for Multimodality neuro-Imaging in Translational Anatomy Research (SIMITAR), Department of Radiology, Stanford University School of Medicine, Stanford, California, USA. Electronic address:
Purpose: A fundamental feature in interpreting gross or neuroimaging brain anatomy is reliance on an assumed high degree of morphologic symmetry in bilateral hemispheres. However, the normal brain is not perfectly symmetrical, and subtle inherent structural asymmetries could potentially confound appreciation of pathology-induced asymmetry or how a given brain asymmetry can relate to its function.
Material And Methods: We review the literature and provide a brief overview of structural asymmetries in normal brain anatomy.
Pars Triangularis Volume Asymmetry and Schneiderian First Rank Symptoms in Antipsychotic-naïve Schizophrenia.
Clin Psychopharmacol Neurosci
August 2021
Department of Psychiatry, National Institute of Mental Health & NeuroSciences (NIMHANS), Bangalore, India.
Objective: Schizophrenia is a disorder of language and self, with first-rank symptoms (FRS) as one of the predominant features in a subset of patients. Abnormal language lateralization is hypothesized to underlie the neurobiology of FRS in schizophrenia. The role of Broca's area with its right-hemispheric counterpart, consisting of pars triangularis (PTr) and pars opercularis (POp) of the inferior frontal gyrus in FRS is undetermined.
View Article and Find Full Text PDFBrain structural and functional asymmetry in human situs inversus totalis.
Brain Struct Funct
May 2018
School of Clinical Sciences, Clinical Research Imaging Centre (CRIC), University of Edinburgh, Edinburgh, UK.
Magnetic resonance imaging was used to investigate brain structural and functional asymmetries in 15 participants with complete visceral reversal (situs inversus totalis, SIT). Language-related brain structural and functional lateralization of SIT participants, including peri-Sylvian gray and white matter asymmetries and hemispheric language dominance, was similar to those of 15 control participants individually matched for sex, age, education, and handedness. In contrast, the SIT cohort showed reversal of the brain (Yakovlevian) torque (occipital petalia and occipital bending) compared to the control group.
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