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    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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    2. Mechanics of head fold formation: investigating tissue-level forces forces during early development

      Mechanics of head fold formation: investigating tissue-level forces forces during early development
      During its earliest stages, the avian embryo is approximately planar. Through a complex series of folds, this flat geometry is transformed into the intricate three-dimensional structure of the developing organism. Formation of the head fold (HF) is the first step in this cascading sequence of out-of-plane tissue folds. The HF establishes the anterior extent of the embryo and initiates heart, foregut and brain development. Here, we use a combination of computational modeling and experiments to determine the physical forces that drive HF formation. Using chick embryos cultured ex ovo, we measured: (1) changes in tissue morphology in living embryos using ...
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