. A treatise on the nervous diseases of children : for physicians and students. sides, even though the lesion in the brain or else-where be unilateral. In somecases of hemiplegia there maybe contracture on the soundside and the reflexes may beincreased on both sides. Pi-tres has collected ten cases inwhich both pyramidal tracts ofthe lateral columns have beendegenerated after unilateral le-sion in the brain. A satisfac-tory explanation of this condi-tion has not yet been given,but the probability is that thereare connections between bothcrossed pyramidal tracts in thespinal cord and also betwe
. A treatise on the nervous diseases of children : for physicians and students. sides, even though the lesion in the brain or else-where be unilateral. In somecases of hemiplegia there maybe contracture on the soundside and the reflexes may beincreased on both sides. Pi-tres has collected ten cases inwhich both pyramidal tracts ofthe lateral columns have beendegenerated after unilateral le-sion in the brain. A satisfac-tory explanation of this condi-tion has not yet been given,but the probability is that thereare connections between bothcrossed pyramidal tracts in thespinal cord and also betweenthe direct pyramidal tract inthe anterior columns and thecrossed pyramidal tract on thesame side of the spinal cord. THE BLOOD-SUPPLY OF THESPINAL CORD. The chief arteries supplyingthe spinal cord are as follows:The anterior spinal, which isdouble at its upper end as itissues from the vertebrals, butits two branches unite belowinto one artery, which is rein-forced by small vessels thatcome off from the vertebral,intercostal, lumbar, and sacralarteries, and pass to the cord. Fig. T3,.—Blood Supply of Spinal Cord. (Dia-gram after Obersteiner and Schafer.) a. ,anterior spinal artery ; r., a central arteriole ;a., an anastomosis branch uniting it with anoth-er arteriole of an adjacent segment; CI., branchto Clarkes column ; , artery of posteriorfissure ; /. m. a., posterior mesial artery ; c,artery of posterior cornua ; p. s. a., branch ofposterior spinal artery passing into gelatinoussubstance ; /., other peripheral or centripetalarterioles passing through white substance ofcord. along with the anterior roots. The posterior spinal arteries are also derived from the vertebrals, intercostal,and other arteries, and pass to the cord next to the posterior roots. Thebranches of these vessels are distributed in the pia matter surrounding thecord, communicating freely with one another by means of transverse anas- 282 THE NERVOUS DISEASES OF CHILDREN: tomoses and sending
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