This chapter discusses the nervous system and reviews suffixes like -phasia and -plegia. It describes aphasia as trouble with verbal communication or writing caused by brain damage, and discusses receptive and expressive aphasia. Paraplegia is defined as partial or complete paralysis of the lower half of the body resulting from spinal cord injury, and affects mobility but not use of the arms and hands. Many paraplegics use wheelchairs and can live normal lives with therapy, though some have medical complications like pressure sores.