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Basal forebrain topography as defined by afferents and efferents: separable circuits to support distinct functions
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Gielow, Matthew Robert. Basal forebrain topography as defined by afferents and efferents: separable circuits to support distinct functions. Retrieved from https://doi.org/doi:10.7282/T3MC91WZ

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TitleBasal forebrain topography as defined by afferents and efferents: separable circuits to support distinct functions
NameGielow, Matthew Robert (author); Krekelberg, Bart (chair); Pare, Denis (internal member); Koos, Tibor (internal member); Baxter, Mark G (outside member); Rutgers University; Graduate School - Newark
Date Created2015
Other Date2015-05 (degree)
SubjectNeuroscience, Basal ganglia
Extent1 online resource xiii, 105 p. : ill.)
DescriptionThe basal forebrain (BF) is a region of heterogeneous neurons, some of which send axon terminals to the cerebral cortex. The main source of acetylcholine in the cortex arises from the cholinergic basal forebrain (BFc). Historically the BFc has been alternately described as diffuse and discrete, which has contributed to incompatible views of the system across and within scientific disciplines. The known anatomical details of the BF are not sufficient to explain the variety of functions it achieves in the cortex. This thesis describes three experiments that further investigate the anatomical details of BF cell topography, outputs, and inputs in the rat. The first utilizes retrograde tracing to show that cells projecting to visual and motor cortices are mostly found in the anterior diagonal bands and posterior basal forebrain, respectively. The BF topography of these two projection populations partially overlaps. There is also a segregation and overlap based on neurotransmitter content. The second experiment queries the BF topography of local afferents to BFc cells via monosynaptic viral tracing in ChAT-cre transgenic rats. BFc cells do not receive afferents from fellow BF cells spread across the entire BF volume. Instead, presynaptic cells coinhabit smaller pockets in which iii their postsynaptic cholinergic targets are found, suggesting the potential for modular control of portions of the BFc at the local level. The final study describes the inputs to BFc cells on the basis of their outputs to four different cortical targets utilizing the same viral tracer as above. It is possible to infect transgenic basalocortical cells via monosynaptic tracing vector injection in the cortex, at the site of axon terminals, thereby only labeling transynaptically those afferents contacting corticopetal BFc cells projecting to a particular cortical region. Subpopulations of basal forebrain cholinergic cells, that send their efferents to different cortical areas, did not receive homogeneous input, but rather received differing complements of synaptic inputs. These results reveal the network connectivity likely to be the precise architecture permissive of the differential control the BFc exerts over its various outputs. Along with this novel architecture comes a number of testable hypotheses put forth in the general discussion.
NotePh.D.
NoteIncludes bibliographical references
Noteby Matthew Robert Gielow
Genretheses, ETD doctoral
Persistent URLhttps://doi.org/doi:10.7282/T3MC91WZ
Languageeng
CollectionGraduate School - Newark Electronic Theses and Dissertations
Organization NameRutgers, The State University of New Jersey
RightsThe author owns the copyright to this work.
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