. Text-book of normal histology: including an account of the development of the tissues and of the organs. eria sulci, given off from the anterior spinalartery and lodged within the anterior median fissure, from whichbranches are distributed to the gray matter. Of the numerousarteries which enter at the circumference, the finer usually terminate THE CENTRAL NERVOUS SYSTEM. 295 within the white substance, while the coarser alone penetrateinto the gray matter, the outer zone of which they in part vessel occupying the posterior median septum, the arteria fis-surse posterioris, is the m
. Text-book of normal histology: including an account of the development of the tissues and of the organs. eria sulci, given off from the anterior spinalartery and lodged within the anterior median fissure, from whichbranches are distributed to the gray matter. Of the numerousarteries which enter at the circumference, the finer usually terminate THE CENTRAL NERVOUS SYSTEM. 295 within the white substance, while the coarser alone penetrateinto the gray matter, the outer zone of which they in part vessel occupying the posterior median septum, the arteria fis-surse posterioris, is the most important of the peripheral branches :twigs also accompany the anterior and posterior root-bundles. At ,the bottom of the anterior median fissure the arteria sulcidivides into two sulco-commissural branches, which, divergingslightly, enter the gray matter to the inner side of the base of theanterior horn. After a short course within the gray substance, thesevessels break up into a number of twigs, which soon form close cap-illary net-works within the anterior and middle parts of the gray Fig. Section of injected spinal cord of child : s, sulcal branch of anterior spinal artery occupying anteriormedian fissure ; c, c, sulco-conimissural vessels from sulcal artery passing to gray matter to formdense net-work ; /, posterior spinal artery, sending off twigs to white matter; around margin of cordnumerous peripheral vessels enter white substance to form open net-work. crescents ; a branch of some size passes backward to supply theregion corresponding to Clarkes column. The sulco-commissuralartery likewise gives off vertical anastomosing branches, onepassing brainward, the other caudalward, to unite with similar off-shoots from the corresponding arteries of different planes. The veinsfollow in general the course of the corresponding arteries : some ofthe blood, however, brought by the sulcal artery is carried off by theperipheral veins. THE MEDULLA. The differences between t
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