Sensitivity

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The following types of disorders of sensitivity associated with damage pathways in the spinal cord and brain. At occurrence of a pathological focus at any level in one half of the spinal cord (the compression of the tumor, stroke or Traumatic destruction) there is a kind of picture of the so-called syndrome of the brown-séquard (see the brown-séquard syndrome), which on the affected side fall movement and proprioceptive (deep) sensitivity below the lesion of the spinal cord, and on the opposite side of the body falls out of pain and temperature sensitivity. With the defeat of both halves of the spinal cord, so that when the spread of pathological focus on the cross-section of the spinal cord, drop out all kinds of sensitivity and movement in parts of the body whose connection with the cortex violated. How can a person be divided into the upper and the lower half, the bottom of which lacks the sensitivity and paralyzed. The level of skin segments below which was the sensitivity, you can judge the level of lesion of the spinal cord. For example, this level for X thoracic segment will be the level of the navel.
With the defeat of the rear pillars of the spinal brain will fall out or be broken proprioceptive sensitivity, which, in addition to the muscle and joints sensitivity that comes with vibration sensitivity and sense of pressure. The defeat of the rear pillars is a characteristic symptom of spinal suchocki (see).
With the defeat of external departments oblong brain falls out of pain and temperature sensitivity on the same side of the face and on the opposite side of the body, which occurs due to damage the downward beam of the trigeminal nerve and Spino-thalamic way. Above oblong brain pathways of all kinds of sensitivity go all together and, accordingly, the lesions occur in gametype, i.e., the person in these cases, as it is divided into right and left halves, including the face, of which one half of sensitivity is missing.
Finally, there may be cortical type of sensitivity disorders, when the affected some part of cortical analyzer and falls sensitivity separate areas, such as socks or gloves (monotype). Suffer and difficult kinds of sensitivity, for example stereognosis, i.e. the ability to determine feels good knowledge of the subject. In these cases the patient can evaluate individual qualities of the subject - hard, cold, round, but cannot synthesize these feelings into one, that is, to know him that is called astereognosis.


The pattern of skin sensitivity, respectively nerves and roots.

Defeat all of the peripheral nerves (which can occur when infections and intoxications) leads to disorders of sensitivity with the buildup to the distal departments, i.e. the most remote from their trophic centre. This type of disorders of sensitivity is the name of the distal, or polyneuritises. With the defeat of individual nerve trunk will fall sensitivity in innervations area of this nerve. For example, the ulnar nerve neuritis along with motor impairment leads to loss of sensation in the skin of the palm and the back of the hand with V and part IV finger. With the defeat of the radial nerve falls sensitivity on the back of the hand, including and first three fingers. All these species are sensitive violations presented in Fig.