A repetitive movement that is difficult, if not impossible to voluntarily control. Tics can affect any group of muscles. The most common are facial tics, such as eye- blinking, nose-twitching, or grimacing. Tics that affect the muscles used to produce speech are known as vocal tics, and can range from grunts or whistles to the repetition of complete words or phrases. Complex motor tics involve multiple, sequenced movements, and can include behaviors such as twirling in place, tapping a certain number of times, or stooping to touch the ground. Tics are believed to arise from differences in or damage to the basal ganglia, a structure deep within the brain that controls automatic movements and that also affects impulsivity.
- Tic disorder
Clonadine), or one of the atypical or older neuroleptics. See also tic, Tourette syndrome.
A small wingless bloodsucking insect that, along with the mite, belongs to the order Acarina. Ticks may be found in tall grass, where they may attach to a passing animal or person. Pulling a tick forcefully out from under the skin may leave the head behind. Ticks can transmit diseases such as Lyme disease, Rocky […]
- Tick bite
A bite from a bloodsucking, parasitic insect that punctures the skin with a sharp beak. The tic burrows into the skin with its head. Tick bites can carry serious illness, including Rocky Mountain spotted fever, other forms of tick typhus, and Lyme disease.
- Tick typhus
Also known as Rocky Mountain spotted fever, an acute febrile (feverish) disease initially recognized in the Rocky Mountain states, caused by Rickettsia rickettsii transmitted by hard-shelled (ixodid) ticks. Occurs only in the Western Hemisphere. Anyone frequenting tick-infested areas is at risk for RMSF. The onset of symptoms is abrupt with headache, high fever, chills, muscle […]
- Tick fever
Rocky Mountain spotted fever.