midbrain morphology trait midbrain cell quantity The proportion or number of cells in the middle division of the three primary divisions of the developing chordate brain or the corresponding part of the adult brain (in vertebrates, includes a ventral part containing the cerebral peduncles and a dorsal tectum containing the corpora quadrigemina and that surrounds the aqueduct of Sylvius connecting the third and fourth ventricles). midbrain cell number Trait.ontology VT:0000898