Diseases of the nervous system : a text-book of neurology and psychiatry . be able to distinguish heat, nor cold, or may havesubjective sensations, haptic hallucinations of the limb areas. Sensory disturbances from cerebral lesions are extremely diverseand important from the diagnostic point of view. They are bestdiscussed with a consideration of the thalamic syndrome. The Thalamic. Syndrome.^—If the thalamus alone is involved orwith partial implication of related extrapyramidal tracts, a character-istic neurological complex develops, termed by Dejerine and his pupil 1 Millard-Gubler; Benedict
Diseases of the nervous system : a text-book of neurology and psychiatry . be able to distinguish heat, nor cold, or may havesubjective sensations, haptic hallucinations of the limb areas. Sensory disturbances from cerebral lesions are extremely diverseand important from the diagnostic point of view. They are bestdiscussed with a consideration of the thalamic syndrome. The Thalamic. Syndrome.^—If the thalamus alone is involved orwith partial implication of related extrapyramidal tracts, a character-istic neurological complex develops, termed by Dejerine and his pupil 1 Millard-Gubler; Benedict, etc., q. v. 2 Jelliffe, The Thalamic Syndrome, Medical Record, February 1, 1910, for references. THALAMIC SYNDROME 475 Roussy the thalamic syndrome. It is one of the middle cerebralartery syndromes. The chief features show usually after an apoplectic attack withthe ordinary signs of a severe hemorrhage, thrombosis, or certain syphilitic cases the attack may be comparatively slight,or the syndrome may develop with no signs of an attack. F. Dorsal columnsensory paths Crossed secondarysensory paths Fig. 234.—To show the position and relations of the optic thalamus in the centralsensory path. Two distinct paths exist in the spinal cord; a crossed secondary path inthe ventrolateral column which conveys impressions of pain, temperature, and touch,and a second uncrossed path in the dorsal column which also carries touch, and in whichrun impulses that underlie the sense of position, the appreciation of movement, the dis-crimination of two points, and the recognition of vibration, size, shape, form, weight,and consistence. This second path decussates in the lower part of the medulla oblongata,but runs separate from the first path, at least as high as the pons. All these secondarysensory fibers, now crossed, terminate in the ventrolateral region of the optic impressions they carry are regrouped here and, through intercalated neurons, aredis
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