furthermore , the brains of the earliest chondrichthyans must have exhibited a wide rhomboid fossa of the medulla , an unfoliated cerebellar corpus divided into anterior and posterior lobes , a bilobed and laminated optic tectum with the majority of the cell bodies located periventricularly , a moderately developed midbrain octavolateralis complex , and a telencephalon consisting of sessile olfactory bulbs and paired cerebral hemispheres with extensive lateral ventricles and thin walls .
C0006104
brains
C0152279
cerebral