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This volume is concerned only with the the syndromes of softening in the pons. A short section is devoted to the history of the subject and to the anatomy and blood supply of this part of the brain. The syndromes are divided into four types, the basis for the classification being the vascularization of the pons as determined by Foix and Hillemand, viz., paramedian, short circumferential and long circumferential vessels. The syndromes are: (1) those consequent on softenings in the paramedian area, (2) those of the short circumferential vessels, (3) mixed syndromes and (4) those of the long circumferential vessels. The etiologic factors are chiefly arteriosclerosis and syphilis.
The chapter devoted to pontile hemiplegia emphasizes that this type of hemiplegia has characteristics which are peculiar to it alone. Among them are the complete absence of aphasia in right-handed persons with a right hemiplegia, absence of loss of consciousness at the