1. In vivo three-dimensional tracking of sperm behaviors in the mouse oviduct

    In vivo three-dimensional tracking of sperm behaviors in the mouse oviduct

    Mammalian sperm evolutionarily acquired complex mechanisms regulating their behaviors, which are thought to be critical in navigating through the female reproductive tract toward fertilization. However, all current knowledge of this process is largely extrapolated from in vitro and ex vivo studies, because in vivo analysis of sperm in their native fertilization environment has not been possible. Here we report a functional optical coherence tomography approach that allows, for the first time, in vivo three-dimensional (3D) tracking of sperm behaviors in the mouse oviduct. Motile sperm are identified with their intrinsic dynamic characteristics. Sperm trajectories are reconstructed in 3D with a ...

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