. Diseases of the nervous system : for the general practitioner and student. jaculation and for theanal reflex. Diseases of the conus presenta special clinical picture which deserves aseparate description. Pathology.—All possible lesions of thespinal cord studied on the preceding pagesmay also affect the conus. We maytherefore have those of myelitis, of hem-orrhage, of tabes, etc. Etiology.—Trauma is the most frequentof all causes. In cases of fracture of the lumbar and sacral vertebras, a fragment is likely to press directlyupon the conus or the roots. Secondary myelitis will follow. Traumama
. Diseases of the nervous system : for the general practitioner and student. jaculation and for theanal reflex. Diseases of the conus presenta special clinical picture which deserves aseparate description. Pathology.—All possible lesions of thespinal cord studied on the preceding pagesmay also affect the conus. We maytherefore have those of myelitis, of hem-orrhage, of tabes, etc. Etiology.—Trauma is the most frequentof all causes. In cases of fracture of the lumbar and sacral vertebras, a fragment is likely to press directlyupon the conus or the roots. Secondary myelitis will follow. Traumamay also produce a hemorrhage in the conus. A blow over the lum-bar region may produce a traumatic myelitis of the conus. An injurybelow the second lumbar vertebra will damage only the cauda equina;at the level of the second lumbar will involve the conus and the caudaequina. An injury immediately above the second lumbar vertebrawill damage the conus alone. The lowest part of the spinal cord is notinfrequently the seat of tumors. The latter may originate in the vertebrae. Fig. 96.—Conus Medullaris(Ajter Raymond.) 292 DISEASES OF CONUS MEDULLARIS or in the cutaneous coverings or else be primary (sarcoma, lymphangi-oma, glioma, gumma). Abscess due to tuberculosis of the vertebraemay also involve the conus. Symptoms. Conus.—From the anatomical fact mentioned above,namely that the conus is the center for the third, fourth and fifth pairsof sacral nerves (Fig. 92), also from the physiological character of theconus, viz. that it contains special centers for micturition, defecation,,etc. (see above), there is no difficulty in presenting a clinical picture of
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectnervous, bookyear1913
