Posted by: Thixia | October 17, 2008

muscular coordination

ataxia /atax·ia/ (ah-tak´se-ah) failure of muscular coordination; irregularity of muscular action.



The unsteadiness and lack of coordination that result from the brain’s failure to regulate the body’s posture and the strength and direction of limb movements. Ataxia is most often caused by disease activity in the cerebellum.




Bruns’ frontal ataxia  a disturbance of equilibrium and gait due to a lesion in the frontal lobe, characterized by assumption of a broad-based gait with the feet flat on the ground and a tendency to retropulsion.


Friedreich’s ataxia  hereditary sclerosis of the dorsal and lateral columns of the spine, usually beginning in childhood or youth; it is attended with ataxia, speech impairment, scoliosis, peculiar movements, paralysis, and often hypertrophic cardiomyopathy.


locomotor ataxia  marked by degeneration of the posterior columns and posterior roots and ganglion of the spinal cord, with muscular incoordination, paroxysms of intense pain, visceral crises, disturbances of sensation, and various trophic disturbances, especially of bones and joints.


motor ataxia  inability to control the coordinate movements of the muscles.


sensory ataxia  ataxia due to loss of proprioception (joint position sensation) between the motor cortex and peripheral nerves, resulting in poorly judged movements, the incoordination becoming aggravated when the eyes are closed.


ataxia-telangiectasia  a severe autosomal recessive progressive cerebellar ataxia, associated with oculocutaneous telangiectasia, abnormal eye movements, sinopulmonary disease, and immunodeficiency.



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