Sensory ataxia

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Sensory ataxia is both a symptom and a sign in neurology. It is a form of ataxia (loss of coordination) caused not by cerebellar dysfunction but by loss of sensory input into the control of movement.

Sensory ataxia is distinguished from cerebellar ataxia by the presence of near-normal coordination when the movement in question is visually observed by the patient, but marked worsening of coordination when the eyes are closed.

Sensory ataxia also lacks the associated features of cerebellar ataxia such as pendular tendon reflexes, scanning dysarthria, nystagmus and broken pursuit eye movements.

Patients with sensory ataxia often demonstrate pseudoathetosis and Romberg's sign. They usually complain of loss of balance in the dark, typically when closing their eyes in the shower or removing clothing over the head.

Sensory ataxia is present in sensory peripheral neuropathies and conditions causing dysfunction of the dorsal columns of the spinal cord such as tabes dorsalis.

Further reading

  • Bastian AJ (1997). "Mechanisms of ataxia". Physical therapy 77 (6): 672–5. PMID 9184691. 
v • d • e
Symptoms and signs: nervous and musculoskeletal systems (R25-R29, 781)
Abnormal involuntary movements
(see also movement disorders)
Gait abnormality
Lack of coordination
Other
v • d • e
Lesions of spinal cord and brain
Spinal cord
Brainstem
Medulla (CN 8, 9, 10, 12)
Pons (CN 5, 6, 7, 8)
Midbrain (CN 3, 4)
Weber's syndrome (ventral peduncle, PCA) - Benedikt's syndrome (ventral tegmentum, PCA) - Parinaud's syndrome (dorsal, tumor)
Cerebellum
Basal ganglia
Cortex
Other

Wikipedia content modification information:

  • This page was last modified on 27 May 2008, at 20:09.

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