<unk>  is a condition in which the body is held in an abnormal position. The person is usually rigid and arches the back, with the head thrown backward. If a person with<unk>  lies on his or her back, only the back of the head and the heels touch the supporting surface.
Opisthotonus
Myoclonus
Lenticonus
Chorea
Dystonia
Hypotonia
Pseudoathetosis
Catatonia