What does the dorsal portion of the midbrain mainly consist of?

The thalamus is a major coordinating center for sensory and motor signaling.The limbic system, along with the hypothalamus, is involved in the regulation of sexual behavior, expression of emotional reactions, and motivation.The amygdala, along with other structures of the limbic system, is involved in the expression of emotional reactions. The hippocampus, along with other structures of the limbic system, is involved in processing of memory and spatial navigation.Pons consists of fibre tracts that interconnect different regions of the brain. The cerebellum has a very convoluted surface in order to provide the additional space for many more neurons.The medulla of the brain contains centres which control respiration, cardiovascular reflexes and gastric secretions. The brain stem forms the connections between the brain and spinal cord. Three major regions make up the brain stem; mid brain, pons and medulla oblongata