Dysmetria (English: wrong length) is a lack of coordination of movement typified by the undershoot or overshoot of intended position with the hand, arm, leg, or eye.
[7] Damage to the proprioceptive nerves does not allow the cerebellum to accurately judge where the hand, arm, leg, or eye should move.
[citation needed] According to the research article cited above, motor control is a learning process that utilizes APPGs.
[8] Disruption of APPGs is possibly the cause of ataxia and dysmetria and upon identification of the motor primitives, clinicians may be able to isolate the specific areas responsible for the cerebellar problems.
[citation needed] A common motor syndrome that causes dysmetria is cerebellar motor syndrome, which also marked by impairments in gait (also known as ataxia), disordered eye movements, tremor, difficulty swallowing and poor articulation.
The cerebellum is the area of the brain that contributes to coordination and motor processes and is anatomically inferior to the cerebrum.
Sensorimotor integration is crucial for performing any motor task and takes place in the post parietal cortex.
Dysmetria of the extremities caused by hemispheric syndromes is manifested in multiple ways: dysrhythmic tapping of hands and feet and dysdiadochokinesis, which is the impairment of alternating movements.
According to sources cited in this article, motor control is a learning process that occurs in the synapses of Purkinje dendrites.
[8] More recent research in electrophysiology has shown modular structures in the spinal cord known as "motor primitives".
[8] The APPG model is a vector sum of all the inputs of the APG, which are units of position, velocity and time.
[8] Saccades are the very quick, simultaneous movements made by the eye to receive visual information and shift the line of vision from one position to another.
Prior to referring a patient to a neurologist, a general practitioner or MS nurse will perform a finger-to-nose test.
[5] After a positive result in the finger-to-nose test, a neurologist will do a magnetic resonance image (MRI) to determine any damage to the cerebellum.
[15] The subjects who have undergone this treatment had no major relapse for six months and disabling motor function problems.
[15] However, these results are limiting at this time because of the small range of subjects who were used for the experiment and it is unknown whether this is a viable option for all MS patients with motor control problems.