The document discusses the nervous system and various speech and sensory disorders. It defines the suffixes "-phasia" and "-esthesia", which are used in naming speech and sensory disorders, respectively. It then examines specific disorders such as aphasia, Broca's aphasia, Wernicke's aphasia, anesthesia, and paresthesia. Paresthesia is defined as an abnormal sensation of burning, numbness, tingling, itching or prickling, most often in the extremities, and potential orthopedic and neurological causes are listed.