( A ) The medulla of the brain is connected to the spinal cord.
( B ) The ventral portion of the midbrain consists mainly of four round swellings (lobes) called corpora quadrigemina.
( C ) Pons consists of fibre tracts that interconnect different regions of the brain.
( D ) Cerebellum has very convoluted surface in order to provide the additional space for many more neurons.
