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Mapping tracts in the human subthalamic area by 11.7T ex vivo diffusion tensor imaging

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Abstract

The cortico-basal ganglia-thalamo-cortical feedback loops that consist of distinct white matter pathways are important for understanding in vivo imaging studies of functional and anatomical connectivity, and for localizing subthalamic white matter structures in surgical approaches for movement disorders, such as Parkinson’s disease. Connectomic analysis in animals has identified fiber connections between the basal ganglia and thalamus, which pass through the fields of Forel, where other fiber pathways related to motor, sensory, and cognitive functions co-exist. We now report these pathways in the human brain on ex vivo mesoscopic (250 μm) diffusion tensor imaging and on tractography. The locations of the tracts were identified relative to the adjacent gray matter structures, such as the internal and external segments of the globus pallidus; the zona incerta; the subthalamic nucleus; the substantia nigra pars reticulata and compacta; and the thalamus. The connectome atlas of the human subthalamic region may serve as a resource for imaging studies and for neurosurgical planning.

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Fig. 1

Adapted from Neudorfer and Maarouf (2018) with permission

Fig. 2

Adapted from Schaltenbrand and Wahren (1977), Mai et al. (2015), and DeArmond et al. (1989)

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Abbreviations

al:

Ansa lenticularis

CM:

Centromedian nucleus

FA:

Fractional anisotropy

fct:

Cerebellothalamic tract

fl:

Lenticular fasciculus

frf:

Fasciculus retroflexus

GPe:

External segment of the globus pallidus

GPi:

Internal segment of the globus pallidus

LG:

Lateral geniculate body

MB:

Mammillary body

MD:

Mean diffusivity

MG:

Medial geniculate body

ml:

Medial lemniscus

mtt:

Mammillothalamic tract

Pf:

Parafascicular nucleus

Pla:

Pulvinar anterior nucleus

PSA:

Posterior subthalamic area

Put:

Putamen

pyt:

Pyramidal tract

RN:

Red nucleus

SN:

Substantia nigra

SNc:

Substantia nigra pars compacta

SNr:

Substantia nigra pars reticulata

stf:

Subthalamic fasciculus

STN:

Subthalamic nucleus

stt:

Spinothalamic tract

tl:

Trigeminal lemniscus

VA:

Ventral anterior nucleus

VAmc:

Magnocellular part of the ventral anterior nucleus

VApc:

Parvocellular part of the ventral anterior nucleus

VLa:

Ventral lateral anterior nucleus

VLp:

Ventral lateral posterior nucleus

VM:

Ventral medial nucleus

VMb:

Basal ventral medial nucleus

VPI:

Ventral posterior inferior nucleus

VPL:

Ventral posterolateral nucleus

VPM:

Ventral posteromedial nucleus

ZI:

Zona incerta

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Acknowledgements

We thank Mr. Zhipeng Hou, who prepared and scanned the tissue block, and Ms. Mary McAllister and Dr. Yvonne Lenz for their help with manuscript editing.

Funding

Some of the results presented here were the result of studies funded by grants from the National Institutes of Health–National Institute of Neurological Disorders and Stroke R56 NS038493, RO1 NS096007-01, and R01NS109298-01 to FAL, R01NS086888 to SM, and National Institute on Aging P50AG05146 to JCT. The contents of this paper are solely the responsibility of the authors and do not necessarily represent the official view of the NIH.

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Correspondence to Kenichi Oishi or Frederick A. Lenz.

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Conflict of interest

SM is co-founder and CEO, and KO is a consultant for “AnatomyWorks.” This arrangement is being managed by the Johns Hopkins University in accordance with its conflict-of-interest policies.

Research involving human participants and/or animals

This study was performed under protocol IRB00101384 for retrospective use of de-identified tissues for research purposes, approved by the Institutional Review Board of the School of Medicine, Johns Hopkins University.

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Oishi, K., Mori, S., Troncoso, J.C. et al. Mapping tracts in the human subthalamic area by 11.7T ex vivo diffusion tensor imaging. Brain Struct Funct 225, 1293–1312 (2020). https://doi.org/10.1007/s00429-020-02066-x

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  • DOI: https://doi.org/10.1007/s00429-020-02066-x

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