Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 43 for “"neuropil"”.
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Cross-species comparisons of the retrosplenial cortex in primates: Through time and neuropil space
… The goal of the present analysis was to compare neuropil space among capuchins, macaques, chimpanzees, and humans to determine if humans significantly differ from the other species. The amount of neuropil space provides a proxy measure of connectivity because a large component of the neuropil is …
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Neurogenese, Wachstum und Integration von lokalen Nervenzellen in einem multisensorischen Neuropil im zentralen Gehrin adulter Insekten.
… des Insektgehirns stellen ein dominierendes neuropiles für multimodal sensorische Integration, die am wichtigsten für die Organisation des olfactorischen Verhaltens und für Gedächtnis und das Lernen. Die MBs enthalten immer eine Kategorie lokale Interneurones, die Kenyon Zellen (KCs). In den …
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Transcriptional response to spatial learning and foraging in honey bees: molecular bases for adult neuroplasticity
… Honey bee mushroom bodies show increases in neuropil volume coincident with the increased cognitive demands of orientation flights and foraging behavior, and treatment with pilocarpine, a muscarinic cholinergic receptor agonist, produces growth of the mushroom body neuropil comparable to that …
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Changes in the Murine Nigrostriatal Pathway Following Pyrethroid and Organophosphate Insecticide Exposure: An Immunohistochemical Study
… a 2-week period. Counts of immunoreactive (IR) neuropil in the dorsolateral striatum were made from four pre-selected fields per striatal tissue section. Counts were compared between matched sections, processed on the same slide, from a treated mouse and its vehicle control. A mean difference …
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Rapid diffusion in the brain extracellular space - biophysical constraints and physiological implications
… molecules, such as glutamate in the hippocampal neuropil (area CA1). Next, we adopt time‐resolved fluorescence anisotropy imaging microscopy to establish the previously unknown instantaneous diffusivity of small molecules in the extracellular space. The result indicates that nanometer‐scale …
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Investigating the Morphology and Behaviour of Quiescent Neural Stem Cells in Drosophila Melanogaster
… insulin signal, and towards the synapse-dense neuropil in the centre of the brain. In this thesis, I investigate the role of these neuroblast primary processes and their effect on stem cell behaviour, including quiescence and reactivation. I have found that quiescent neuroblasts can be …
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Postembryonic Development and Adult Plasticity of the Mushroom Bodies in the Honey Bee Brain
The mushroom bodies are distinctive, paired neuropils in the insect brain. Convergence of numerous sensory modalities in the mushroom bodies indicates that they may be a center for sensory integration. Ablation and lesioning experiments have also established a role for this brain region in …
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Sensory Ecology of Foraging in Bumblebees
… olfactory sensilla and the first olfactory neuropil in the bumblebee brain, the antennal lobes. I found that the pronounced size polymorphism exhibited by bumblebees also effects their olfactory system. Sensilla number (I measured the most common olfactory sensilla type, s. placodea), …
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IMPACT OF PESTICIDES ON THE NEURAL STRUCTURE OF THE HONEY BEE, APIS MELLIFERA
… body lip (olfactory) and collar (visual) neuropil regions in adult-treated honey bees. These data indicate that sublethal doses of fipronil can alter the structure of the adult honey bee nervous system, possibly through induced synaptic pruning. These results potentially link impaired …
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Cofilin-actin rods: quantification and comparison to tau pathology in a human longitudinal aging study and developing probes to measure localization and activity of NADPH oxidase 2, a component of the prion-dependent rod inducing pathway
… phosphorylated tau protein, quantified rod and neuropil thread areas in brain sections from each subject. Rods in the hippocampal formation were most prevalent in the entorhinal cortex, the first brain region to show pathology during development of AD. Comparison of rod and neuropil thread …
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Migration of olfactory ensheathing cells grafted into adult rat spinal cord
… the spinal cord will migrate into the neuropil in the absence of demyelination. To achieve these aims, we developed an in vivo model for studying the migratory ability of OECs within the adult rat spinal cord. A small focal EtBr-induced demyelination of the dorsal funiculus …
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Cannabinoid CB1 Receptor Expression and Localization in the Dorsal Horn of Male and Female Human and Rat Spinal Cord Tissue
… and humans. Qualitatively, we observed increased neuropil immunostaining in the SDH of rats and humans, and somatic staining in deeper laminae. Quantitative results indicated a significant increase in CB1R immunoreactivity in the SDH when compared to the deeper dorsal horn laminae of male and …
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Activity and Structure of Auditory Brain Neurons Underlying Phonotactic Behaviour in Female Crickets
… Moreover, the group labeling of the auditory neuropil in cricket brain shown in my thesis demonstrated that there are at least 51 neurons in the auditory neuropil. The cell bodies are grouped into six clusters with five in the hemisphere ipsilateral and one in the hemisphere contralateral to …
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Visualization of neuronal geometry in ventral nerve cord ganglia of Acheta domesticus
… The central and ventral parts are occupied by a neuropil mass. The lateral nerves of the ganglion contain both motor and sensory fibers which arise from the dorsal and ventral roots, respectively, within the ganglion.
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Experience-Dependent Plasticity in the Mushroom Bodies of the Honey Bee Brain
… forager bees have an increase in volume of the neuropil associated with the mushroom bodies, a region of the insect brain implicated in learning, memory, and multimodal sensory integration. To study this phenomenon, I have developed an assay to control foraging experience in the lab while …
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Lost in Translation: Variations in WNT Signaling and Other Translational Changes in a Drosophila Model of ALS
… While Dlp/GPC6 forms puncta in the Drosophila neuropil and ALS spinal cords, it is reduced at the neuromuscular synapse in flies suggesting compartment specific effects of TDP-43 proteinopathy. These findings together with genetic interaction data show that Dlp/GPC6 is a novel, physiologically …
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The Mouthparts of Ants
… different sets of motor neurons share the same neuropil in the suboesophageal ganglion. In addition, some motor neurons invade specific parts of the neuropil. The labiomaxillary complex of ants is essential for food intake. I investigated the anatomical design of the labiomaxillary complex in …
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AN ANATOMICAL AND IMMUNOCYTOCHEMICAL STUDY OF THE PRIMATE TEMPORAL AND FRONTAL CORTEX
… synapses were, however, present in the neuropil. The same ultrastructural features of the adult cortex were also encountered in the infant, with certain exceptions: 1) Many of the infant neurons had less densely packed heterochromatin, but greater numbers of free ribosomes, compared with …
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A light and electron microscope investigation of the host-parasite relationship in the brains of mice with congenital toxoplasmosis.
… parasitophorous vacuole membrane and in the host neuropil, immediately adjacent to the tissue cyst. The inter-relationship between inflammatory lesions associated with small vessels, in close proximity to intact tissue cysts, suggest that there may be 'migration' of these cells, in an ordered …
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Differences in the Communicative Behavior and Neurobiology of Chimpanzees (Pan troglodytes) and Bonobos (Pan paniscus)
… was also no difference in lateralization of neuropil fraction (a measure of the space between neurons and glial cells in the gray matter) of Brodmann’s areas 44 or 45. These data are discussed in relation to the hypothesis that observed differences in the communicative strategies and …
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