. Journal of comparative neurology . tid artery; , facial artery; , lingualartery; , occipital artery; , superior thyroid artery; Md., lower jaw; Tr.,trachea. The course of the internal carotid arteries within the skullto the point where a single median vessel pierces the dura, hasalready been described. Encephalic arteries. The vessels of this region are representedin figure 7 as pinned out and seen from above. Postreiorlythe two vertebral arteries unite in a normal fashion to form themain basilar trunk. The origin of the anterior spinal artery isnormal. The posterior inferi
. Journal of comparative neurology . tid artery; , facial artery; , lingualartery; , occipital artery; , superior thyroid artery; Md., lower jaw; Tr.,trachea. The course of the internal carotid arteries within the skullto the point where a single median vessel pierces the dura, hasalready been described. Encephalic arteries. The vessels of this region are representedin figure 7 as pinned out and seen from above. Postreiorlythe two vertebral arteries unite in a normal fashion to form themain basilar trunk. The origin of the anterior spinal artery isnormal. The posterior inferior cerebellar arteries are small andarise from the basilar. A similar anomaly has been reported by 202 D. DAVIDSON BLACK Blackburn (1) in a few of his cases. The basilar artery is longand gives off numerous irregular branches. Si?^ pairs of thesebranches arise in the pontine region. The superior and anteriorinferior cerebellar arteries arise from a common branch of thebasilar. Of the two, the superior cerebellar is much the Fig. 7 Diagram of encephalic arteries pinned out and seen from above. ,basilar artery; , anterior inferior cerebellar artery; , spinal artery; ,vertebral artery; , left posterior cerebral artery; , median carotidartery; , posterior communicating artery; , posterior inferior cere-bellar artery; , superior cerebellar artery. X 5. Blackburn () has noted that when the anterior inferiorcerebellar artery is ill developed, the superior cerebellar arteryoccasionally sends branches to reinforce it. He also noted thatwhen the posterior inferior cerebellar arteries are absent or small,and arising from the basilar, the anterior inferior cerebellar arter-ies send down compensating branches. In this case, both supe-rior and posterior inferior cerebellar arteries are small and theanterior inferior cerebellar arteries are proportionately enlargedand send branches in both directions. A CASE OF CYCLOPIA 203 Anteriorly
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmedicine, bookyear191
