The image is a drawing of different parts of a child’s brain stem and surrounding structures. The cross section of the brain stem show the three main parts: the midbrain, which develops from the middle of the brain, the medulla oblongata, which connects to the spinal cord, and the pons, which is located between the medulla oblongata and the midbrain. Copyright 2004 American Society of Clinical Oncology. Robert Morreale/Visual Explanations, LLC.