Signs of a cerebellum lesion

Static ataxy – it is infringement of statics in rest (shaking).

Dynamic ataxy – it is locomotion coordination disorder at performance of targeted movements. A tremor of extremities – so-called intentional tremor (during movements, stops during rest) – is observed.

Walking is shaky, “drunk”.

Cause of cerebellar ataxy is the disturbance of сonjugative work of muscles – agonists and antagonists, disproportion of locomotion – dysmetria. Rapid change of one locomotion by others, inverse ones – adiadohokinesis (pronation and supination) is impeded.

Asynergia – it is disturbance of mutual conjugated movements.

Atony – it is loss of muscle tone (anterior part of cerebellar posterior lobe is responsible).

Astasia – it show up in ability of muscles to realize oscillating motions (tremor, shaking) and in disabilities to conjoint tetanic contraction.

Tremor – it is oscillating motions in various body segments.

The excision of cerebellum does not cause disappearance of reflectory responses; tonic reflexes of brainstem are non-changed.

Nistagm

Impossibility to draw circle

Megalography – very big letters

Dysmetria – impossibility to assess the distance to farther and nearer subjects, to assess muscular forces necessary to be applied to lighter and heavier subjects due to disturbed muscular tone

Explosive speech – very loud, with accents not on proper syllables.

To investigate movement co-ordination

Romberg’s pose - the investigated person is proposed to move his feet together, to rise his head, to put his hands alongside his trunk. To determine whether his pose is stable. Complicated Romberg’s pose: the doctor proposes to the investigated person to stretch his hands forward horizontally. Initially his eyes must be opened, than closed. Cerebellum functions disorders are accompanied by unstable pose (falling forward is observed at vermis anterior parts injuries; ahead - at vermis caudal parts disorders).

Walking - the investigated person must go on right line with his opened eyes, then with closed ones. At good performing these tests the investigated person is proposed to go on right line such that sock of one foot was touched to the heel of the other one.

Phalanx walking - step movements towards; the investigator put his attention to the step clearance and to the possibility of fast stoppage at sudden order (at injury one can see ataxic walking: legs are significantly extensed and putted forward).

Asynergy investigation

Babynsky probe - the investigated person lies on solid bed, he is asked to cross his hands on his thorax and to stand up (legs are rised without legs in people with cerebellum injury).

Ozhehovsky probe - the investigated person while his standing is strongly leant on doctor’s palm. At sudden taking doctor’s hands away the investigated person must be on his place, must be unmoved or turned ahead (in sick person this probe leads to the turning his trunk forward).

Stuart-Holms’s probe - upper extremities proximal parts asynergy is checking. The hand putted till horizontal state investigated person must strongly bend in crural joint (antebrachium and hand in pronation state, hand is in fist). Doctor tries to straighten the investigated person antebrachium out and at sudden resistance stoppage the investigated person hand mustn’t beat himself in his thorax. For the control the investigator’s second hand must be putted to the place of allowed beat. In a healthy person muscles-antagonists are involved quickly and the beat is prevented.