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Sensitivity

The primary perception of all stimuli in the human body is carried out by receptors - specific cells that perceive the effects of the external and changes in the internal environment of the body.

Receptors-Exteroreceptors Proprioreceptors Interoreceptors

General features of three-neutron paths of surface and deep sensitivity

• The first neuron is located in the intervertebral node.

• The fibers of the second neuron cross.

• The third neuron is located in the nuclei of the thalamus.

• The thalamocortical path passes through the posterior third of the posterior leg of the inner capsule and radial crown and terminates in the posterior central gyrus and upper parietal region.

The path of surface sensitivity.

Exteroreceptors Peripheral nerves Spinal node (1 neuron of the surface sensitivity pathway) Back roots of the spinal cord Rear horns of the spinal cord of the same side (2 neuron of the surface sensitivity pathway) Through the anterior commissure to the opposite side (obliquely upward 2–3 segments higher) As part of the anterior lateral cords up The lower part of the external nucleus of the optic tubercle (3 neuron of the path of surface sensitivity) From the ventrolateral nucleus of the thalamus, the path of surface sensitivity runs h Res rear third rear leg inner capsule is composed of a radiant crown (corona radiata) in the cerebral cortex. The posterior central gyrus and upper parietal region

The path of deep sensitivity.

Proprioreceptors Peripheral nerves Spinal cord node (1 neuron of the path of deep sensitivity) Rear roots of the spinal cord Rear cords of the spinal cord on the same side (without going into the horns of the spinal cord) 1. Gaul bundle - medially located fibers 2. Burdah bundle - laterally located fibers Medulla oblongata - nuclei of the posterior cords (2 neurons of the path of deep sensitivity) Cross at the level of the medulla oblongata with the formation of the medial loop (lemniscus medialis), to which at the level of the anterior sections of the bridge tsya fiber path fiber surface sensitivity and sensory fibers from cranial nerve nuclei - conductors of all kinds of sensitivity from the opposite side of the body.
Ventrolateral nuclei of the thalamus (3 neurons of the deep sensitivity path) From the ventrolateral nucleus of the thalamus, the path of deep sensitivity passes through the posterior third of the posterior leg of the internal capsule, goes as a part of the radiant corona (corona radiata) into the cerebral cortex. The posterior central gyrus and upper parietal region

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Types of sensitivity disorders.

1. The peripheral type of disorder is a violation of sensitivity in the innervation zone of the peripheral nerve. Occurs with damage to the peripheral nerve or plexus.

2. Segmented type of disorders - violation of sensitivity in the zone of segmental innervation. Occurs with damage to the posterior root of the spinal cord or spinal ganglion. For conductors of surface sensitivity, a segmental type of disorder is also characteristic of lesions of the horn of the spinal cord and anterior commissure.

3. Conducting type of disorder - a violation of sensitivity throughout the entire level below the lesion of the pathway. It occurs with damage to the posterior and lateral cords, the brain stem, the thalamus, the posterior third of the posterior leg of the inner capsule, the subcortical white matter of the brain.

4. Cortical type of disorders - local loss of sensitivity (more often as monoanesthesia, etc.) when lesions of the projection area of ​​the surface and deep sensitivity of the cerebral cortex

5. Dissociated sensitivity disorders - loss of some types of sensitivity while maintaining others. They occur with damage to the posterior horns of the spinal cord, the anterior gray commissure, the lateral and posterior cords of the spinal cord, the intersection and lower divisions of the medial loop, the lateral divisions of the medulla oblongata.
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Sensitivity

  1. Sensitivity and types of sensory impairment
    Sensitivity is the body's ability to perceive irritations emanating from the environment or from its own tissues and organs. The analyzer consists of three departments: the receptor, the conductor, and the cortical. Receptors are the terminal formations of sensitive nerve fibers that perceive changes in the body or outside it and transmit it in the form of impulses.
  2. RESTORE SENSITIVITY
    When reading this section, one should take into account the fact that we are talking about the possibility of restoration of sensitivity, and not about its normalization. With anatomical damage to the spinal cord, restoration of sensitivity proceeds in a certain sequence. The first to restore surface skin sensitivity. The gradually appearing foci of skin sensitivity expand and
  3. SENSITIVITY STUDY
    In the study of sensitivity, they are based on the testimony of patients in response to certain stimuli. However, the study of sensitivity in children presents great difficulties, since a child cannot always clearly differentiate irritation, correctly analyze his feelings and adequately describe them. In young children, often have to be limited to research only
  4. SENSITIVITY STUDY
    In the study of sensitivity, they are based on the testimony of patients in response to certain stimuli. However, the study of sensitivity in children presents great difficulties, since a child cannot always clearly differentiate irritation, correctly analyze his feelings and adequately describe them. In young children, often have to be limited to research only
  5. SENSITIVITY VIOLATION
    Pain syndrome occurred in 87 patients (100%). Local soreness in the area of ​​trauma and pain symptoms accompanying spastic convulsive events were noted in 87 patients (100%); phantom pains - in 13 patients (14.9%); radicular pain - in 87 patients (100%); causalgia was observed in 17 patients (19.5%). In addition to pain, a violation of all types of sensitivity was observed below
  6. Sensitivity
    Sensitivity - the body's ability to perceive irritation emanating from the environment or from its own organs and tissues. In physiology, the entire totality of afferent systems is united by the concept of reception. Sensitivity is a special case of reception, when afferent impulses lead to the formation of sensations. Not everything that undergoes reception is felt. For example: afferent to
  7. SENSITIVITY VIOLATION
    In the clinic, it is customary to distinguish between types and types of sensitive disorders. The following types of sensory impairment exist, which are distinguished depending on a qualitative or quantitative change in sensations. Anesthesia - the complete loss of any kind of sensitivity - is due to the fact that, due to some obstacles, the pulses do not reach the corresponding cortical paths
  8. Sensitivity and its disorders
    Sensitivity is the body's ability to perceive irritations emanating from the environment or from its own tissues and organs. Teaching I.P. Pavlova on analyzers laid the foundation for a natural understanding of the nature and mechanisms of sensitivity. Each analyzer consists of a peripheral (receptor) department, a conductor part and a cortical department. Receptors - Special
  9. Hearing sensitivity
    Our auditory organ is very sensitive. With normal hearing, we are able to distinguish sounds that cause negligible (calculated in fractions of a micron) vibrations of the eardrum. The sensitivity of the auditory analyzer to sounds of different heights is not the same. The human ear is most sensitive to sounds with a frequency of oscillation from 1000 to 3000. As you decrease or
  10. SENSITIVITY TYPES
    The nervous system developed during the body’s interaction with the environment. This process is dynamic, the nervous system changes and is constantly improved in phylogenesis and ontogenesis. When signals from the external and internal environment arrive, the nervous system provides supportive reactions and maintains homeostasis. A complex of afferent systems that receives information at
  11. PARTICULAR SYMPTOMATOLOGY OF SENSITIVITY DISORDERS
    Damage to the trunk of the peripheral nerve causes a violation of all types of sensitivity in the zone of its innervation, i.e., according to the peripheral mononeuric type. This is because nerve fibers pass through the nerve trunk for various types of sensitivities. The defeat of individual nerve fibers can be more or less deep, which leads to unequal violation of certain types
  12. SENSITIVITY STUDY METHODOLOGY
    Tactile (tactile) sensitivity, with which a person recognizes tangential irritations, is examined, offering the researcher with closed eyes to record every irritation applied to various parts of the body surface in the form of touches with a thin paper or a piece of cotton wool. The study of pain sensitivity is to recognize the irritation caused by the tip
  13. Polyneuritic type of sensitivity disorder
    The zone and nature of sensory impairment detected in a patient can help to resolve the issue of localization of his pathological focus. Topical diagnosis will undoubtedly become more reliable if, at the same time, information about other changes in the neurological status associated with sensitivity disorders is taken into account. With the defeat of various levels of the system
  14. Cortical Type Disorder
    (Internet) Sensitivity - the body's ability to perceive irritation emanating from the environment or from its own organs and tissues. In physiology, the entire totality of afferent systems is united by the concept of reception. Sensitivity is a special case of reception, when afferent impulses lead to the formation of sensations. Not everything that undergoes reception is felt. For example:
  15. Sensitivity
    Under the sensitivity refers to the ability to the elementary form of mental reflection - sensation. Unlike irritability, the concept of “Ch.” Uses the criterion of signaling: Ch. - reflection by the body of such influences that are not directly biologically significant (eg, due to their energy weakness), but can signal the presence (change) of other conditions environment
  16. PARTICULAR SYMPTOMATOLOGY OF SENSITIVITY DISORDERS
    Damage to the trunk of the peripheral nerve causes a violation of all types of sensitivity in the zone of its innervation, i.e., according to the peripheral mononeuric type. The defeat of the nerve plexus (cervical, brachial, lumbar, sacral) causes sensitive, motor and autonomic disorders in the area innervated by the nerves, combined with pain and paresthesia and relate to
  17. SENSITIVITY SYNDROMES AND SENSITIVITY FUNCTIONS
    Three main types of sensitivity disorders are distinguished depending on the distribution borders: peripheral - in the area of ​​nerve innervation, segmental - in the area of ​​innervation of the segment of the spinal cord, posterior (sensitive) root or intervertebral ganglion, conductor - below the level of damage to the conductors of sensitivity in the spinal cord or brain. Depending on the level of lesions
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