The reaction of degeneration

The reaction of degeneration is observed at atrophies which develop as a result of a lesion of a peripheric impellent neurone. Other atrophic processes in muscles (артрогенные, from a divergence, at diseases of the most muscular apparatus) are not accompanied by degeneration reaction. Research buy cipro mg of reaction of a degeneration has certain value in clinic and allows to carry out differential diagnostics of muscular atrophies of the various nature. Besides, electroexcitability research gives the chance to establish early the diagnosis of disturbances of conductivity of a nerve, abilities of muscles and allows to judge dynamics of process, establishing, for example, transition from a full reaction of degeneration to partial in the course of flaccid paralysis restoration.
To judge normal electroexcitability of nerves and muscles or to establish those or other deviations from norm, it is necessary to know the average sizes of electroexcitability received as a result of research of a considerable quantity of healthy faces. Tab. 4 in which for some nerves and muscles the minimum and maximum sizes in norm of galvanic excitability are specified is resulted; the threshold of stimulation is defined in миллиамперах.
In the course of electroexcitability studying it has been established, that reduction is most easier turns out from certain sites of nerves and muscles, from so-called impellent points, or boring points. There are special schemes with their indicating (fig. 10 - 14).
The reaction of degeneration, characteristic for flaccid paralyses, concerns a category of qualitative changes of electroexcitability. The same category concern миотоническая
And myasthenic reactions. At миотонии excitability of a nerve remains normal, the muscle after the received reduction is relaxed extremely slowly. For a myasthenia the extreme fatigability of a muscle affecting in fast attrition сократительной of its ability at repeated borings by a current is characteristic.
Quantitative changes of electroexcitability of nerves and muscles concern: 1) its rising when for reduction reception currents smaller are required, than. In norm, forces, or 2) electroexcitability dropping when for effect reception application of currents of larger force, than for healthy people is necessary.
1 - n. hypoglossus; 2 - quadratus menti; 3 - levator menti: 4 - orbicularis oris; 5 - zygomaticus; 6 - orbicularis palpebra-rum; 7 - corrugatar superficialis; 8 - the item facialis; 9 - frontalis; 10 - temporalis; 11 - auricularis posterior; 12 - SJleiiius; 13 - n. accessorius.
Newer and much more sensitive method buy rimonabant mg of research of electroexcitability of nerves and muscles is the chronaximetry. It has been established, that current action is defined not only its intensity, but also duration of action on a nerve or a muscle.
At first the rheobase is defined, i.e. That minimum intensity of a direct current, which is necessary to cause effect - reduction. Then the current twice larger intensity (a double rheobase) is applied and the minimum time, sufficient for reductions (chronaxia) is defined in thousand shares of second (сигмах) by the special apparatus (chronaximeter).
Хронакоиметрия has allowed to establish a number of the new and interesting facts and patterns in physiology and pathologies of nervous system. The doctrine about a chronaxia is closely closed with concept about lability (N.E.Vvedensky, A.A.Ukhtomsky).
So, it has appeared, that proximally located muscles have shorter chronaxia, than distal; a muscle and иннервирующий its nerve have almost identical chronaxia; muscles-SYNERGISTS have an identical chronaxia, whereas muscles-antagonists - other; the top extremities have a chronaxia approximately in 2 times smaller, than extensors (on the bottom extremities there is a return parity).