Key result
Three-dimensional micron-scale reconstruction reveals novel longitudinal ventricular myofiber bands orthogonal to circumferential fibers.
Why the study?
A confirmed model of myofiber geometry does not yet exist due to the limited spatial resolution of whole heart imaging and the piecemeal nature of high-magnification studies.
The discovery of a longitudinal myofiber system in the ventricular walls provides a new paradigm for understanding heart wall mechanical contraction and electrical wave conduction.
Challenges conventional circumferential myofiber model; hypothesis-generating for ventricular mechanics, pending human validation.
The coordinated contraction of myocytes drives the heart to beat and circulate blood. Due to the limited spatial resolution of whole heart imaging and the piecemeal nature of high-magnification studies, a confirmed model of myofiber geometry does not yet exist. Using microscopy and computer vision we report the first three-dimensional reconstruction of myofibers across entire mouse ventricular walls at the micron scale, representing a gain of three orders of magnitude in spatial resolution over the existing models. Our analysis reveals prominent longitudinal bands of fibers that are orthogonal to the well-known circumferential ones. Our discovery impacts present understanding of heart wall mechanics and electrical function, with fundamental implications for the study of diseases related to myofiber disorganization.
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Dileep et al. (2022) studied Healthy heart wall anatomy. Tissue clearing, confocal microscopy and computer vision 3D reconstruction was evaluated on Three-dimensional reconstruction of myofiber geometry and orientation. Micron-scale three-dimensional reconstruction revealed prominent longitudinal bands of myofibers across ventricular walls that are orthogonal to the previously established circumferential fibers.
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