The biventer lobule is triangular in shape; its apex points backward, and is joined by the gray band to the pyramid.

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

Flocculus

The flocculus is a small lobe of the cerebellum at the posterior border of the middle cerebellar peduncle anterior to the biventer lobule....

by the postnodular fissure.