As extrapyramidal syndrome ( EPS ) refers to a disturbance in the movement. This leads to an increase or decrease in movements, combined with increased or decreased muscle tension .
The motor fibers that do not belong to the pyramidal pathway are called extrapyramidal nerve tracts . They run from the core areas of the cerebral cortex in the premotor field through the subcortical basal ganglia , the nucleus ruber and the substantia nigra of the midbrain , the olive nucleus of the medulla oblongata and further down the spinal cord . There are links and a. with the cerebellum .
The extrapyramidal system is responsible for unconscious, involuntary movement, automated movement sequences and coordination of tone and movement, e.g. B. the swinging of the arms while walking. It has an inhibiting and controlling effect on the voluntary motor skills of the pyramidal path.
Disturbances are hypo kinetic - hypertonic ( Parkinson's disease ) or hyper kinetic - hypotonic ( chorea , ballism, etc.) and can also be caused by drugs (e.g. neuroleptics ). This can lead to ataxia , tremor , start inhibition (impaired initiation of a movement) and a tendency to fall.