Nervous and mental diseases . Fig. 189.—Abnormal abduction of thighs, the split position, due to hypotonus in Fig. 190.—Abnormal flexibility of spine and hips in tabes due to bypotonus. DISEASES OF THE WHITE MATTER OF THE CORD. 43 Disturbance of the Visual Apparatus.—Both the external andinternal portions of the ocular mechanism are frequently impaired intabes. Ptosis and squints, usually unilateral, sometimes bilateral, are of com-mon occurrence in the preataxic as well as in the later stages of loco-motor ataxia. They may be and often are temporary and fleeting, almostmomentary, but
Nervous and mental diseases . Fig. 189.—Abnormal abduction of thighs, the split position, due to hypotonus in Fig. 190.—Abnormal flexibility of spine and hips in tabes due to bypotonus. DISEASES OF THE WHITE MATTER OF THE CORD. 43 Disturbance of the Visual Apparatus.—Both the external andinternal portions of the ocular mechanism are frequently impaired intabes. Ptosis and squints, usually unilateral, sometimes bilateral, are of com-mon occurrence in the preataxic as well as in the later stages of loco-motor ataxia. They may be and often are temporary and fleeting, almostmomentary, but show a marked tendency to recur and occasionally arepermanent. Careful questioning will commonly recall to a tabeticsmind some such ocular experience. Its temporary character is the bestevidence of its tabetic, we may even say of its syphilitic, nature. Anyof the extrinsic muscles of the eye may be selected by the disease, butthose under the control of the third cranial nerve show more than theirdue proportion of paralytic disturbances. They may be gradually in-vaded, and a progressive external ophthalmopleg
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