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The Open Neuroimaging Journal (1)
Behrens, Timothy E.J. (1)
D'Arceuil, Helen (1)
D’Arceuil, H.E (1)
Johansen-Berg, Heidi (1)
Klein, Johannes C. (1)
Mackay, Clare E. (1)
Rushworth, Matthew F.S. (1)
de Crespigny, Alex J (1)
de Crespigny, Alex J. (1)
Year of Publication
Imaging Stroke Evolution after Middle Cerebral Artery Occlusion in Non-human Primates
The Open Neuroimaging Journal
This article reviews imaging approaches applied to the study of stroke in nonhuman primates. We briefly survey the various surgical and minimally invasive experimental stroke models in nonhuman primates, followed by a summary of studies using computed tomography, positron emission tomography and magnetic resonance imaging and spectroscopy to monitor stroke from the hyperacute phase (within minutes of the onset of cerebral ischemia) to the chronic phase (1 month and beyond).
Stroke; Primates; MRI; CT; PET; DSA; Diffusion MRI; Perfusion.
Topography of connections between human prefrontal cortex and mediodorsal thalamus studied with diffusion tractography
Klein, Johannes C.
Rushworth, Matthew F.S.
Behrens, Timothy E.J.
Mackay, Clare E.
Studies in monkeys show clear anatomical and functional distinctions among networks connecting with subregions within the prefrontal cortex. Three such networks are centered on lateral orbitofrontal cortex, medial frontal and cingulate cortex, and lateral prefrontal cortex and all have been identified with distinct cognitive roles. Although these areas differ in a number of their cortical connections, some of the first anatomical evidence for these networks came from tracer studies demonstrating their distinct patterns of connectivity with the mediodorsal (MD) nucleus of the thalamus. Here, we present evidence for a similar topography of MD thalamus prefrontal connections, using non-invasive imaging and diffusion tractography (DWI–DT) in human and macaque. DWI–DT suggested that there was a high probability of interconnection between medial MD and lateral orbitofrontal cortex, between caudodorsal MD and medial frontal/cingulate cortex, and between lateral MD and lateral prefrontal cortex, in both species. Within the lateral prefrontal cortex a dorsolateral region (the principal sulcus in the macaque and middle frontal gyrus in the human) was found to have a high probability of interconnection with the MD region between the regions with a high probability of interconnection with other parts of the lateral prefrontal cortex and with the lateral orbitofrontal cortex. In addition to suggesting that the thalamic connectivity in the macaque is a good guide to human prefrontal cortex, and therefore that there are likely to be similarities in the cognitive roles played by the prefrontal areas in both species, the present results are also the first to provide insight into the topography of projections of an individual thalamic nucleus in the human brain.
Anatomy; DTI; Human; Macaque; Thalamus
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