9 Move the cursor over the descending aorta. The name of the structure under the mouse cursor will be displayed in the text field to the right (j).
10 Move the cursor over the checkbox in the "Show label at cursor". Now the name of the anatomical entity will be shown at the cursor. When you move the cursor over the image the name will change depending on which entity that lies under the cursor. (In the image below the cursor in over the descending aorta)