Besides, from red kernels through a visual hillock there are ways to extrapyramidal system (binding it with a cerebellum) and to a brain cortex. To number церебеллофугальных conductors (through corpus restiforme) to сетевидной substances (formatio reticularis) an oblong brain and the fibers going from nucleus tecti of a cerebellum concern a vestibular kernel also.
From a kernel of a vestibular order ultram nerve fibers tractus vestibulo-spinalis, going down on periphery of a frontlateral column of a spinal cord from top to bottom (fig. 16, 7) and coming to an end, as well as fibers tractus rubro-spinalis, at cells of forward horns begin. Thus, communication of a cerebellum with a spinal cord, its segments and a musculation is carried out not only through rubrospinal, but also through vestibulo-spinal ways. At last, through the same vestibular (дейтерсово) a kernel the cerebellum is bound by means of a back longitudinal fascicle to kernels of third cranial nerves and, hence, with an oculomotor musculation (fig. 38 see).
Analyzing the listed communications, we can be convinced of the following.
1. The cerebellum receives continuously притекающие impulses from joints and muscles of all body: trunks, extremities, a head, eye muscles etc., and also from a vestibular mechanism. These impulses reach a cerebellum, mainly through the bottom legs, and come to an end in its more ancient departments - palaeocerebellum, i.e. In a worm.
Return regulating impulses go through the top legs to red kernels and through tractus rubro-spinalis, vestibulo-spinalis and a back longitudinal fascicle reach cells of forward horns of a spinal cord (or impellent kernels of cranial nerves) and via peripheric impellent neurones musculations reach. The named closed system (worm) serves as reflex system of balance of a body (a trunk and “roots” of the bottom extremities).
2. The cerebellum joins in extrapyramidal system, sending the impulses through the top legs in red kernels, and therefrom through visual hillocks - in striatum and pallidum. The Way back to a musculation passes through the same rubrospinal, vestibulo-spinal ways, a back longitudinal fascicle and a tekto-spinal way (fig. 56 see).
3. The cerebellum is bound to a brain cortex: from a cerebellum, from a cortex of its hemispheres to nucleus dentatus; therefrom through the top legs - to a red kernel, a visual hillock, and at last, to a cortex. From a brain cortex, mainly from frontal lobes, vpxl there are tractus cortico-cerebellares, reaching cortexes of a cerebellum through its average legs. The further way goes to nucleus dentatus and through the top legs - to red kernels. A way to a musculation - the same rubrospinal (монаковский) a fascicle, etc.
New systems of a cerebellum, its hemisphere are bound to a brain cortex. Here regulation of movements of extremities is presented, apparently.
In the surveyed cerebellar system there are three basic decussations:
1) the top legs (brachia conjunctiva) -
2) rubrospinal (монаковских) ways -
3) average legs of a cerebellum (brachia pontis) - ponto-tserebelljarnyh fibers.
Thanks to presence of the named decussations becomes clear, that cerebellar disorders arise at a lesion: 1) the cerebellum - on the centre party, 2) cortexes of a brain and red kernels - on opposite.
In a cerebellum there is a projection. It is necessary to believe, that in a worm the trunk musculation, in hemispheres - extremities, especially their distal departments is presented.
Cerebellum function is reflex maintenance of a muscle tone, balance, coordination and a synergy of movements. At a cerebellum lesion there is buy cipro a number of impellent disorders and character.
1. Gait disorder. Atakticheski-mozzhechkovaja, or so-called “drunk”, a gait grows out not only balance disturbances, but also an asynergia. The patient goes, widely placing feet and reeling, that especially sharply affects at turns. A deviation aside at walking, and in the expressed cases and falling, are observed more often towards a cerebellar lesion.
2. Интенционное the tremor is observed at movement and is absent in rest. It is found out most sharply in the end of movement and it is investigated in arms with the help a finger-nasal, and in feet by means of pjatochno-knee assay. The task blindly to get by an index finger in an end of the nose is given to the patient; the more close to the purpose, the the tremor of a finger or all brush and an arm is more distinctly and more sharply found out. It is even better found out интенционное a tremor in arms by a different way: the patient concerns with an index finger молоточка or a finger investigating with open eyes, and hammer position some times varies. Pjatochno-knee assay is made at the laying patient who is offered to lift highly at first a foot, then to concern with a heel of a knee another and to spend a heel downwards on a forward surface of an anticnemion. It is necessary to specify, that the investigated should concern only with a heel of a surface of an anticnemion, instead of lean against it.
3. The nystagmus (twitching of eyeballs at their abduction), observed at a cerebellum lesion, happens horizontal, than vertical or ротаторным is more often; the indicating that it is more expressed at a view in the sick party, unreliably. There are doubts, whether the nystagmus can be a symptom of a lesion of the cerebellum in general and whether is it exclusively symptom стволового lesions. However it is admissible, that «the cerebellar nystagmus» is private implication интенционного tremors of eye muscles.
4. Адиадохокинез it is found out at attempt quickly to make alternately opposite movements. So, patients do not manage to change quickly a pronation for a brush supination: awkward, wrong movements turn out.
The dysmetria or, more precisely, buy rimonabant movements can be found easily out following reception: investigated it is offered to hold brushes the palms extended forward up, with divorced fingers; it is necessary to turn quickly the order brushes palms downwards; on the party where there are cerebellar disorders, this movement is made with superfluous rotation of a brush.
At the offer to concern with a heel of one foot of a knee another (in lying position) the patient brings feet at above knee and concerns with a hip heel (a hyperflexion phenomenon).
6. Мимопопадание, or промахивание, at so-called it is found out to “indication assay» as follows: to the patient an index finger 3 times are offered 2 - to get to the finger put before it investigating or in молоточек: after that the patient closes eyes and continues the same task. In an arm in which there are cerebellar disorders, it becomes perceptible промахивание wide of the mark, more often кнаружи.
7. The alalia is private implication of cerebellar disorder of movements; speech loses smoothness, becomes scanned, explosive, slowed down.
8. The hypotension of muscles affecting in slackness, flabbiness of muscles, in superfluous excursion in joints, is found out at research of passive movements. It can be accompanied by dropping сухожильных reflexes of extremities.
At cerebellum lesions can be observed and other symptoms.
The Asynergia is expressed in disturbance of coordination of work of some the muscular groups necessary for realisation of this or that movement. One of asynergia implications is so-called flexion combinee (сокращ.) - сочетанное a hip and trunk flexion. Investigated lays on a back, it is better on a rigid couch without a headboard and a pillow; at attempt to sit down with the arms crossed on a breast there is сочетанное to a flexion of a trunk a flexion one or both (at a bilaterial lesion) feet.