these brain centres ( ranked according to falling values of the coefficient of variation vr , of the interspecific mean ) are : lobus facialis , l. vagus , central acustic area , crista cerebellaris , bulbus olfactorius , eminentia granularis , stratum opticum ( of the optic tectum ) , torus longitudinalis , nucleus habenularis , valvula cerebelli , corpus cerebelli , telencephalon , tectum opticum , diencephalon , torus semicircularis , mesencephalic tegmentum .
C0228405
optic tectum
C0039433
tectum