A TBI disrupts brain functioning and can result from a significant blow or jolt to the head or by a penetrating injury to the head such as from a bullet. The ABA Medical-Legal Guides: Head Trauma and Brain Injury for Lawyers, is the fourth book in the ABA Medical-legal Guides series. This guide provides in-depth medical-legal information regarding injury to the brain, that critical control center for the entire body as well as the spinal cord and those structures surrounding these components of the central nervous system.