Below the level of the cerebral cortex lies the thalamus, the brain's information relay network. Surrounding the thalamus is a group of structures, the limbic system, which is involved in survival behavior and emotions. Closely linked with the limbic system is the hypothalamus, which has overall control of the autonomic nervous system. The cingulate gyrus is involved in survival behavior. The hippocampus is involved in memory storage.
Sagittal midline of the brain: normal anatomy | Radiology Case | Sagittal T1 Normal sagittal midline demonstrating the central venous vasculature and cisterns. 1. Great cerebral vein of Galen. 2. Internal cerebral vein. 3. Thalamostriate vein. A. Cistern of the laminae terminalis. B. Chiasmatic cistern. C. Interpeduncular cistern. D. Ambient cistern. E. Quadrigeminal cistern. F. Cerebellopontine cistern. G. Prepontine cistern. H. Lateral cerebellomedullary cistern. I. Cisterna magna
Racing car sign: the racing car sign refers to widely spaced lateral ventricles due to agenesis of the corpus callosum with intervening Probst bundles. Appearances on axial MRI or CT are reminiscent of a formula one car seen from above, with the tires represented by the widely spaced frontal horns, and the dilated trigones (colpocephaly).