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  • Book
    Robert Barretto.
    Optical microendoscopy is an emerging modality for imaging in live subjects. Using gradient refractive index (GRIN) microlenses, microendoscopy enables subcellular-resolution imaging in deep tissues that are inaccessible by traditional imaging techniques. We present a platform of methods and technologies that build upon GRIN microendoscopy: 1) miniaturized microscopes for imaging in awake, behaving animals, 2) methods for imaging contractile dynamics in the muscles of animal and human subjects, 3) chronic brain preparations that allow for longitudinal examinations of subcellular neuronal features and disease progression, and 4) novel microendoscope probes whose imaging capabilities approach that of standard water-immersion microscope objectives. When combined with the broad sets of available fluorescent reporters, and minimally invasive surgical preparations, the work described in this dissertation enables sophisticated experimental designs for probing how cellular characteristics may underlie or explain behavior, in models of both healthy and diseased states.