habit spasm


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tic

(tik), Do not confuse this word with tick.
Habitual, repeated contraction of certain muscles, resulting in stereotyped individualized actions that can be voluntarily suppressed for only brief periods, for example, clearing the throat, sniffing, pursing the lips, excessive blinking; especially prominent when the person is under stress; there is no known pathologic substrate.
See also: spasm.
[Fr.]

habit spasm

an involuntary twitching or tic. It usually involves a small muscle group of the face, neck, or shoulders and causes movements such as spasmodic blinking or rapid jerking of the head to the side. The movements are often generated by emotional conflicts rather than by organic disorder. They may serve as a release for tension or anxiety.

Tourette syndrome

An autosomal dominant disorder (OMIM:137580) appearing in childhood that is characterised by multiple motor and vocal tics present for more than 1 year; obsessive-compulsive behaviour, attention-deficit disorder, coprolalia, echolalia, and other psychiatric disorders may occur.

Molecular pathology
Defects of SLITRK, which encodes an integral membrane protein involved in neurite outgrowth, have been linked to Tourette syndrome.

tic

(tik)
Habitual, repeated contraction of certain muscles, resulting in stereotyped individualized actions that can be voluntarily suppressed for only brief periods (e.g., clearing the throat, sniffing, pursing the lips, excessive blinking); especially prominent when the person is under stress; there is no known pathologic substrate.
See also: spasm
Synonym(s): Brissaud disease, habit spasm.
[Fr.]