Loss of function of the nervous system
Loss of one or another function of the nervous
system may be due to either the destruction or inhibition of activity of
institutions engaged in this function. An example of a loss function due to
damage (destruction) of the structure can be flaccid paralysis of the muscles
at the death of its innervating motor neurons of the spinal cord affected by
poliomyelitis virus, either by suspension or degeneration of the motor nerve.
If the damage of structures related to the sensory systems, the sensitivity of
the corresponding drop types (pain, visual, etc.).
The degree of loss of function is determined not
only by the number of affected nerve cells. Around the lesion in the brain
tissue occurs reversibly damaged area and inhibited neurons. Inhibition plays
the role of protective mechanisms ( "protective inhibition" according
to Pavlov), protecting neurons reversibly damaged, the functional load, which
can contribute to their death. Due to switching off of the function of neurons
increases the functional level of the defect; This situation occurs when
poliomyelitis, traumas of the central nervous system and others. Recovery in a
given volume of function is not associated with the regeneration of neurons in
therapeutic effects (neurons do not regenerate), and with the improvement of
the condition and the normalization of the damaged neurons and reversibly with
the removal of protective inhibition.
Loss of function in the event of structural
defects is not immediately. It occurs when the damage has reached such a size
that has become insufficient compensation mechanisms and overlapping of
impaired function. In other words, at this stage of the disease process has
made significant development, and does not begin, as is commonly thought. In
such cases, the doctor has to deal with quite a neglected disease. That is why
the therapy is not always effective even for this, and such an early stage is
important for diagnosis of pathological changes in the preclinical stage of the
process.
Loss of function due to the inhibition of activity
of the central nervous system structures can also occur when the inhibitory
effect of strengthening. So if hyperactivity medulla, which normally have a
braking effect on the spinal cord reflexes, the spinal reflexes associated with
the function falls. Known reflex sensitivity loss, hysterical paralysis, suggestive
(hypnotic) movement disorders and sensitivity, and other phenomena of the
inhibitory function of suppression.
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