The brain stem connects the brain to the spinal cord. It kind of looks like a tail coming out the back. It includes three parts including the posterior-most _5__, the bulb-like _6__ and anterior-most _7__. This region of the brain contains centers for breathing and heart rate. It also serves as a relay station for nerve impulses traveling between the brain and the spinal cord.

In the brainstem, the cranial nuclei of sensory nerves are located __, motor nuclei  __ and mixed nerves __.

The dorsal column system crosses to the contralateral side of the nervous system at the level of the before reaching the in the ___. medulla; primary somatosensory cortex; parietal lobe spinal cord; primary motor cortex; frontal lobe medulla; primary motor cortex; frontal lobe spinal cord; primary somatosensory cortex; parietal lobe Question 2 Which of the following are true about somatotopy and retinotopy? Adjacent parts of the body or retina are represented far away each other, rather than in neighbouring areas of the cortex All items are true 1 pts These maps are 'fixed' and cannot be changed by experience The 'maps' for both are distorted to represent differences in the density of input

Figure 4 below shows a midsagittal section through a human brain. Identify the structure most important for the circadian clock and explain your reasoning. Figure 4. Midsagittal section of a human brain with key structures labelled. Anterior is to the left.