biventer lobule biventer lobule the biventer lobule (or biventral lobule) is a region of the cerebellum. it is triangular in shape; its apex points backward, and is joined by the gray band to the pyramid. biventer lobuleanterior view of the cerebellumdetailsidentifierslatinlobulus biventerneuronames670neurolex idnlx_anat_20081211ta98a14.1.07.216ta25816fma72526anatomical terms of neuroanatomy the lateral border is separated from the inferior semilunar lobule by the postpyramidal fissure. the base is directed forward, and is on a line with the anterior border of the tonsil, and is separated from the flocculus by the postnodular fissure.