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Afferent systems. Anatomical and functional features. Lesion syndromes at different levels

The significance of afferent systems is indicated by the anatomical features of the nervous system. So, in the posterior (afferent, sensitive) roots of the spinal cord there are up to 1 million fibers (in each), and in the anterior (efferent, motor) there are only 200 thousand fibers. Afferent systems located in the lateral and posterior columns of the spinal cord occupy a buoyant territory than descending efferent paths. The organism can respond to any painful irritation with an instant reflex reaction that occurs at the level of the spinal cord. However, the sensation of pain

her analysis, emotional coloring, the construction of behavioral strategies are associated with cerebral systems of the brain stem, thalamus, limbico-reticular complex and the cerebral cortex. Acute pains are most often topically determined in a certain way and are based on the local pathological process. The nature, nature of the pathological process, the degree of involvement of pain receptors determine the intensity and peculiarities of pain.



Strio Pallidum (afferent systems)

The stri-pallidary system has numerous connections:

• paths connecting the formations of the stria-pallidar system;

• the paths connecting the strio-pallidary system with the end motor pathway and muscle; mutual relations with various departments of the extrapyramidal system and the cortex of the big hemispheres;

• ways of afferentation.

There are several ways to deliver impulses of the stri-pallidar system to the segmental motor system:

• Monakovsky rubro-spinal way from red nuclei;

• vestibular-spinal path from the vestibular nucleus;

• reticulo-spinal pathways from the reticular formation;

• tekto-spinal ways from chetrovekhremiya;

• paths to the motor nuclei of the cranial nerves.

Providing automated performance of motor acts, the stri-pallidary system should receive comprehensive information about the state of muscles, joints, tendons, body position in space, etc.
D. Afferent systems serving the stri-pallidum (informational impulses from the “sensitivity collector” —thalamus, from the cerebellum, reticular formation, corrective signals from the cortex, etc.) create feedback rings with the efferent pathways that inform commanding signals. Pulse circulation does not stop, combining all motor and afferent systems into a single whole. With the defeat of the nuclei of the extrapyramidal system and their connections, various symptoms occur. The main ones are hypotonic-hyperkinetic and akinetic-rigid syndromes. Violations of the extrapyramidal system are manifested in the form of changes in motor function, muscle tone, autonomic functions, emotional sphere.

The significance of afferent systems is indicated by the anatomical features of the nervous system. So, in the posterior (afferent, sensitive) roots of the spinal cord there are up to 1 million fibers (in each), and in the anterior (efferent, motor) there are only 200 thousand fibers. Afferent systems located in the lateral and posterior columns of the spinal cord occupy a buoyant territory than descending efferent paths. The organism can respond to any painful irritation with an instant reflex reaction that occurs at the level of the spinal cord. However, the sensation of pain

her analysis, emotional coloring, the construction of behavioral strategies are associated with cerebral systems of the brain stem, thalamus, limbico-reticular complex and the cerebral cortex. Acute pains are most often topically determined in a certain way and are based on the local pathological process. The nature, nature of the pathological process, the degree of involvement of pain receptors determine the intensity and peculiarities of pain.
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Afferent systems. Anatomical and functional features. Lesion syndromes at different levels

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