Ex vivo diffusion-weighted MRI tractography of the Göttingen minipig limbic system. 2020

Johannes Bech, and Dariusz Orlowski, and Andreas N Glud, and Tim B Dyrby, and Jens Christian H Sørensen, and Carsten R Bjarkam
CENSE, Department of Neurosurgery, Department of Clinical Medicine, Aarhus University Hospital, Aarhus University, Palle Juul-Jensens Boulevard 165, Entrance J, 8200, Aarhus N, Denmark. jb@clin.au.dk.

The limbic system encompasses a collection of brain areas primarily involved in higher cognitive and emotional processing. Altered function in the limbic circuitry may play a major role in various psychiatric disorders. This study aims to provide a high-quality ex vivo diffusion-weighted MRI (DWI) tractographic overview of the Göttingen minipig limbic system pathways, which are currently not well described. This may facilitate future translational large animal studies. The study used previously obtained post-mortem DWI scans in 3 female Göttingen minipigs aging 11-15 months. The tractography performed on the DWI data set was made using a probabilistic algorithm, and regions of interest (ROIs) were defined in accordance with a histological atlas. The investigated pathways included the fornix, mammillothalamic tract, stria terminalis, stria medullaris, habenulo-interpeduncular tract, and cingulum. All the investigated limbic connections could be visualized with a high detail yielding a comprehensive three-dimensional overview, which was emphasized by the inclusion of video material. The minipig limbic system pathways displayed using tractography closely resembled what was previously described in both human studies and neuronal tracing studies from other mammalian species. We encountered well-known inherent methodological challenges of tractography, e.g., partial volume effects and complex white matter regions, which may have contributed to derouted false-positive streamlines and the failure to visualize some of the minor limbic pathway ramifications. This underlines the importance of preexisting anatomical knowledge. Conclusively, we have, for the first time, provided an overview and substantial insight of the Göttingen minipig limbic system.

UI MeSH Term Description Entries
D008032 Limbic System A set of forebrain structures common to all mammals that is defined functionally and anatomically. It is implicated in the higher integration of visceral, olfactory, and somatic information as well as homeostatic responses including fundamental survival behaviors (feeding, mating, emotion). For most authors, it includes the AMYGDALA; EPITHALAMUS; GYRUS CINGULI; hippocampal formation (see HIPPOCAMPUS); HYPOTHALAMUS; PARAHIPPOCAMPAL GYRUS; SEPTAL NUCLEI; anterior nuclear group of thalamus, and portions of the basal ganglia. (Parent, Carpenter's Human Neuroanatomy, 9th ed, p744; NeuroNames, http://rprcsgi.rprc.washington.edu/neuronames/index.html (September 2, 1998)). Limbic Systems,System, Limbic,Systems, Limbic
D009434 Neural Pathways Neural tracts connecting one part of the nervous system with another. Neural Interconnections,Interconnection, Neural,Interconnections, Neural,Neural Interconnection,Neural Pathway,Pathway, Neural,Pathways, Neural
D005260 Female Females
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D013552 Swine Any of various animals that constitute the family Suidae and comprise stout-bodied, short-legged omnivorous mammals with thick skin, usually covered with coarse bristles, a rather long mobile snout, and small tail. Included are the genera Babyrousa, Phacochoerus (wart hogs), and Sus, the latter containing the domestic pig (see SUS SCROFA). Phacochoerus,Pigs,Suidae,Warthogs,Wart Hogs,Hog, Wart,Hogs, Wart,Wart Hog
D013556 Swine, Miniature Genetically developed small pigs for use in biomedical research. There are several strains - Yucatan miniature, Sinclair miniature, and Minnesota miniature. Miniature Swine,Minipigs,Miniature Swines,Minipig,Swines, Miniature
D038524 Diffusion Magnetic Resonance Imaging A diagnostic technique that incorporates the measurement of molecular diffusion (such as water or metabolites) for tissue assessment by MRI. The degree of molecular movement can be measured by changes of apparent diffusion coefficient (ADC) with time, as reflected by tissue microstructure. Diffusion MRI has been used to study BRAIN ISCHEMIA and tumor response to treatment. Magnetic Resonance Imaging, Diffusion,Diffusion MRI,Diffusion Weighted MRI,Diffusion MRIs,MRI, Diffusion Weighted
D066127 White Matter The region of CENTRAL NERVOUS SYSTEM that appears lighter in color than the other type, GRAY MATTER. It mainly consists of MYELINATED NERVE FIBERS and contains few neuronal cell bodies or DENDRITES. Cerebellar White Matter,Cerebellar White Matters,Matter, Cerebellar White,Matter, White,Matters, Cerebellar White,Matters, White,White Matter, Cerebellar,White Matters,White Matters, Cerebellar

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