Brain. Coloured composite 3-D magnetic resonance imaging (MRI) and computed tomography (CT) scan of a human brain, seen from the front. The ventricles (pink) circulate the cerebrospinal fluid (CSF), which cushions the brain. Two lateral ventricles lie either side of the mid-line of the brain, one in each cerebral hemisphere. They communicate with the fourth ventricle (bottom centre). Beneath the lateral ventricles lie the sensory- processing thalami (orange) and the hypothalamus (green, centre), which controls emotion and body temperature, and releases chemicals that regulate hormone release from the pituitary gland (green, above fourth ventricle, which is pink).