. The practice of medicine; a text-book for practitioners and students, with special reference to diagnosis and treatment . ltogether escape. Other investigators place the primary lesion at the point where theroots penetrate the dura; and still others at the place where the posteriorroots pass through the pia to enter the posterior columns of the cord. Symptoms.—The characteristic symptoms of tabes are easily divisibleinto three sets: motor, sensory, and reflex. In addition to these there TABES DORSAL!S 911 are others not essential, but striking, including modifications of specialsense and cer
. The practice of medicine; a text-book for practitioners and students, with special reference to diagnosis and treatment . ltogether escape. Other investigators place the primary lesion at the point where theroots penetrate the dura; and still others at the place where the posteriorroots pass through the pia to enter the posterior columns of the cord. Symptoms.—The characteristic symptoms of tabes are easily divisibleinto three sets: motor, sensory, and reflex. In addition to these there TABES DORSAL!S 911 are others not essential, but striking, including modifications of specialsense and certain visceral symptoms characterized by pain and known ascrises. The special sense modifications include especially that ofvision, while of crises the gastric are most striking. The motor phenomena are usually the most prominent, whence thedisease takes the name of locomotor ataxia, but this symptom may beabsent for years, and hence the inappropriateness of the term. The dis-tinctive symptom is a loss of co-ordinating power in the legs, having itssimplest illustration in the unsteady gait of a drunken man. It is in-. FiG. 154.—^Lumbar Region, h h, posteromedian root zones (Flechsig) only slightly de-generated, i, middle root zones (Flechsig) degenerated, g, normal ventral fields. Thissection represents the earUer lesions of tabes. Figure 154 should be compared with Figure 153—{after Spiller). tensified when the patient attempts to walk with his eyes closed, and,indeed, in its early development does not appear except when the eyes areclosed. It is usually unaccompanied by a loss of power or muscular wasting,but the latter may be extreme. On the other hand, inco-ordination is byno means always the earliest symptom and it may, ind,eed, never be de-veloped, while there is usually a preataxic stage in most cases of inco-ordination may be shown sometimes, before otherwise evident,by directing the patient to place the heels and toes together and then toclose the eyes,
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