| Term | Definition |
| abscess (brain) | secondary to infection in body (ear, sinuses) |
| ALS amyotrophic lateral sclerosis | progressive disease, cause unknown, starting with loss of coordination and leading to extensive disability |
| Bell's palsy | paralysis of one side of face, inflammation of seventh cranial nerve |
| cerebral palsy | paralysis resulting from developmental defects or trauma; variety of symptoms; may be spastic, flaccid, athetoid (writhing movements) |
| concussion | injury to brain d/t blow to head |
| convulsion (seizure) | sudden disturbances in mental functions and body movements |
| Guillain-Barre Syndrome | acute, rapidly progressive polyneuropathy with muscular weakness and sensory loss, usually following infection or immunization |
| hematoma | "blood tumor" (clot) |
| herpes zoster | "shingles": an acute inflammatory reaction in spinal or cranial nerve d/t dormant viral infection in body |
| multiple sclerosis MS | brain and cord contain areas of degenerated myelin;visual problems are common; manifested by tremors, slurred speech, eventual disability. |
| Parkinson's disease | manifested by expressionless face, slow movement, muscular tremors, stooped posture, shuffling gait, rigidity. |
| sciatica | severe pain in the leg along the course of sciatic nerve, felt at back of thigh running down inside of the leg; may be associated with herniated disk |
| spina bifida | hernia of meninges (and cord) to surface of the back; congenital anomaly. |
| Babinski's sign | reflex response; when sole of foot is stroked, big toe turns up instead of down (normal in newborn, but pathologic later on) |
| Romberg test | checking balance by having person touch tip of nose with index finger with eyes closed; arems are outstretched with eyes closed; observer watches for "drift" |