. A manual of diseases of the nervous system. other arteries, which reach thecord by the anterior and posterior roots. The anterior pass for themost part inwards to the anterior median fissure, where they ar«connected by vertical branches, continuous in direction, so as to forman anterior spinal artery. From this a series of branches pass back-wards in the anterior median fissure, which may be called anteriormedian arteries, and are of great importance, supplying most of thegrey matter. At the bottom of the fissure each divides into twobranches, a riglit and left commissural artery, which pass
. A manual of diseases of the nervous system. other arteries, which reach thecord by the anterior and posterior roots. The anterior pass for themost part inwards to the anterior median fissure, where they ar«connected by vertical branches, continuous in direction, so as to forman anterior spinal artery. From this a series of branches pass back-wards in the anterior median fissure, which may be called anteriormedian arteries, and are of great importance, supplying most of thegrey matter. At the bottom of the fissure each divides into twobranches, a riglit and left commissural artery, which passes outwards * The fibres that piss to the postero-external column have heen termed the mediangroup, and the rest of the root-fibres the lateral group, those entering the caputbeing distiiiijuished as an internitdiate group. But each investigator describesmuch the same facts in a different method, and adopts an original nomenclature,which renders it better at present to keep the facts more prominent in the mindthan the names. STEUCTUUB. 227. and backwards through the commissure, displacing its fibres (andhence, in section, the commissure often appears to be interruptedwhere the fibres are divided obliquely). At the end of the commis-sure each divides into an anterior central artery, which supphes mostof the anterior horn, and a posterior central, which supplies the inter-mediate grey matter and the neck of the posterior horn, including theregion of the posterior vesicular column. Each commissural artery,moreover, before dividing, gives of£ a branch which immediatelybifurcates into an up-ward and downward ves- —^ ^^-Bel, each continuous witha corresponding branchfrom the next commis-sural artery above andbelow—the anastomoticartery. This effects avertical continuity ofanastomoses within thecord, like that of theanterior spinal arteryoutside the cord. The peripheral arteriespass inwards from thesurface. K posterior me-dian artery courses in themedian septum, givingbranches t
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