Brainstem lesion leads to crossed paralysisalternated

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Brainstem lesion leads to crossed paralysis(alternated): ipsilateral symp toms of cranial nerve nucleus lesion and central hemiparesis of contralateral extremities. Spinal cord lesions -Over cervical intumescence(C1-C4) lesion leads to central tetraparesis conductive impairment of all sensitivity kinds and pelvic disorders. -Cervical intumescence(C5-Th1) lesion gives peripheral paraparalysis in arms, central paraparalysis in legs with conductive impairments of all sensitiv ity kinds and pelvic disorders. -Thoracic part of the spinal cord(Th3-Th12) lesion leads to inferior central para paralysis with conductive impairments of all sensitivity kinds and pelvic disorders. -Lumbar intumescence(L1-S2) lesion leads to inferior peripheral parapa resis with conductive impairments of all sensitivity kinds and pelvic disor ders. - Half of the spinal cord diameter lesion gives Brown-Sequard syndrome movement impairments and deep sensitivity disorders on the lesion side, con ductive impairments of superficial sensitivity on the opposite side. -Spinal cord anterior corn lesion leads to segmental peripheral paresises ith muscles fibrillation without sensitive disorders. -Medullary cone(S3-S5) lesion does not give paresises, sensitivity is im paired in the perineum, true enuresis will occur. Peripheral nervous system lesions
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Anterior radix lesion leads to segmental peripheral paresises without sensi tive impairments, fascicular twitches can be observed. Peripheral nerve lesion leads to peripheral paresises with sensitivity disorders in the never innervation area. 19. Describe the anatomy of the cerebellum and 6-neuroned efferent cortico-cerebellar-spinal tract. Tractus Cortico-ponto-cerebello-dento-rubro-spinalis 1st order neurons are located in the frontal, temporal and occipital parts of cortex, then internal capsule, cerebral peduncles, nuclei of pons, 2nd order neurons are on the same side, crossing occurs and the cortex of cerebellum are located 3rd order neurons then to nucleus dentatus (4th order neuron) then nucleus ruber (5th order) on the opposite side. NB: one crossing before nucleus ruber and another after nucleus ruber. Then opposite part of brain stem, funiculus lateralis, anterior horn (location if 6th order neuron), radix anterior, spinal nerve, plexus nervosus, peripheral nerve and finally muscles. NB: in case of damage of cortex of cerebellum, the symptoms appear contralaterally. 20. Describe the anatomy of the anterior and posterior spinocerebellar tracts. Anterior spinocerebellar tract (Gorbes pathway) 1st order neurons located or begins are ganglion intervertebralis, dendrites start in muscles and joints, axons as posterior roots, enter the spinal cord. 2nd order neurons located in the posterior horn, then crossing on the level of anterior grey fissure - funiculus lateralis on the opposite side, medulla, pons, then AGAIN CROSSING TO OPPOSITE SIDE OF THE CEREBELLUM, superior cerebellar peduncles and finally vermis.
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  • Winter '18
  • Jane doe

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