Weber syndrome belongs to alternating syndromes (they are alternating paralysis, or cross paralysis) - neurological syndromes, in which the defeat of the cranial nerves on the side of the focus causes sensory and motor disorders on the opposite side of the body.
Weber's syndrome - causes and area of injury
Alternative syndromes develop on the basis of:
- hemorrhages in the brain ;
- strokes;
- neoplastic processes;
- inflammation of the membranes of the brain (basal meningitis).
In Weber's syndrome, neurologic disorders are observed at the base of the midbrain and affect the nuclei or roots of the oculomotor nerve and the pyramidal pathways (the area responsible for fine coordination of movements, in particular, playing a big role in the upright movement).
On the side of the lesion, disturbances are observed on the part of the visual system, on the opposite side of the body - motor and sensitivity disorders.
Symptoms of Weber Syndrome
With Weber's syndrome lesions are asymmetric. From the side of the hearth there are:
- the trembling of the century;
- mydriasis - the dilatation of the pupil, not associated with a reaction to light;
- divergent strabismus ;
- double image in the eyes;
- violation of the focus of vision;
- displacement of the eyeball forward (bulging eye), sometimes with a shift to the side;
- partial or complete paralysis of the eyelid, as well as the internal muscles of the eye.
On the opposite side can be observed:
- paresis of the muscles of the face and tongue;
- increased tonus of flexion muscles in the arm and extensor in the leg;
- possible tremor of hands and feet;
- involuntary limb movements;
- disorders of wrist flexion and defense reflexes;
- sensitivity disorders;
- the phenomenon of a folding knife - in the process of passive extension of the limb, a strong resistance is first felt during the examination, which gradually weakens.