Diseases of the nervous system : a text-book of neurology and psychiatry . cess of filtration leaves all the impulses associated withpostural and spacial recognition to continue their course unalteredin the posterior columns; they are the survivors of peripheral groupsbroken up by the passing away of certain components into secondaryafferent systems. At any point in the spinal cord, these columns trans-mit not only impulses from the periphery which are on their way, aftera shorter or longer passage, to regrouping and transformation, but atthe same time they form the path for impulses, arising
Diseases of the nervous system : a text-book of neurology and psychiatry . cess of filtration leaves all the impulses associated withpostural and spacial recognition to continue their course unalteredin the posterior columns; they are the survivors of peripheral groupsbroken up by the passing away of certain components into secondaryafferent systems. At any point in the spinal cord, these columns trans-mit not only impulses from the periphery which are on their way, aftera shorter or longer passage, to regrouping and transformation, but atthe same time they form the path for impulses, arising both in thecutaneous and deep afferent systems, which undergo no regroupinguntil they reach the nuclei of the medulla oblongata. Thus, a lesion confined to one-half of the spinal cord, even at itshighest segment, may interfere with the passage of sensory impulses,some of which are travelling in secondary paths, whilst others are stillwithin the primary level of the nervous system. All impulses concernedwith painful and thermal sensations from distant parts, disturbed by. FRACTURE AND DISLOCATION SYNDROMES 345 such a lesion, will be travelling in secondary paths and will have comefrom the opposite half of the body; for, after regrouping, they havepassed across the spinal cord. But those impulses underlying theappreciation of posture, the compass test, size, shape, form, weight,consistence, vibration, will be affected on the same half of the bodyas the lesion. They still remain in paths of the primary level andhave undergone no regrouping. (See Plates X and XL) In such a case the parts on the side opposed to the lesion may beinsensitive to pain, heat and cold; but all the postural and spacialaspects of sensation will be perfectly maintained. Yet, all power ofrecognizing position, of estimating size, shape, form and weight, or ofdiscriminating the two compass points, will be lost in the limbs whichlie on the side of the lesion, although tactile sensibility and localizationof the s
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Keywords: ., book, bookcentury1900, bookdecade1910, booksubjectmentaldisorders
