Download Cerebrovascular Surgery: Volume I by Jack M. Fein (auth.), Jack M. Fein M.D., Eugene S. Flamm PDF

By Jack M. Fein (auth.), Jack M. Fein M.D., Eugene S. Flamm M.D. (eds.)

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In the region of the anterior perforated substance, it gives rise to the lenticulostriate arteries, which will be described with the vascularization of the basal ganglia region. The MCA turns at 90° in its second segment and enters the depth of the Sylvian fissure to reach the insula, where it divides into two or three main trunks (Fig. 4 A-D). From these main trunks at the upper limit of the insula arise the vessels that will pass out of the Sylvian fissure and around the frontal, parietal, and temporal opercula to supply the cortex of these regions.

The carotid artery then passes vertically a short distance to enter the cavernous 12 Georges Salamon, Andrew Gouaze, Sharon E. Byrd, and lean-Marie Corbaz ¢¢¢¢ Fig. 1. Different varieties of circle of Willis. (After Lazorthes et al. 27) ¢¢¢¢ ¢1)¢¢ 1)¢¢¢ ¢¢¢¢ ¢ sinus. At this level, the artery is close to the sella turcica. It initially ascends laterally to the lower posterior borders of the sella and then turns, passing anteriorly on the lower lateral border of the sella in the carotid sulcus. The artery then curves upward, medially to the anterior clinoid process.

The orbitofrontal artery emerges from the Sylvian fissure at the level of the pars orbitalis. It usually arises as a single branch but sometimes it may divide early into two branches. It vascularizes primarily the external part of the orbital surface of the frontal lobe and the most inferior part of the inferior frontal gyrus. Prefrontal artery. The prefrontal artery emerges from the Sylvian fissure usually at or just anterior or posterior to the pars triangularis of the inferior frontal gyrus.

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