Frazee, a vascular specialist, was referring to the sagittal sinus, a large vein that goes over the top of the skull from front to back and then splits to take blood back to the heart.
22.
The parietal emissary vein connects it with the superior sagittal sinus; and as it passes across the mastoid portion of the temporal bone, it receives the mastoid emissary vein which connects it with the transverse sinus.
23.
The fluid then flows around the superior sagittal sinus to be reabsorbed via the arachnoid villi ( or granulation villi ) into the venous sinuses, after which it passes through the jugular vein and major venous system.
24.
Largest granulations lie along the superior sagittal sinus, a large venous space running from front to back along the center of the head ( on the inside of the calcified ones are referred to as pacchionian bodies.
25.
It appears the boys have only one between them, so it will be assigned to one of them and the doctors will try to redirect other veins to act like the sagittal sinus in the other twin.
26.
Along the upper margin is a shallow groove, which, together with that on the opposite parietal, forms a channel, the sagittal sulcus, for the superior sagittal sinus; the edges of the sulcus afford attachment to the falx cerebri.
27.
The process of letting other veins take over the functions of the sagittal sinus could be accomplished by prolonging the entire process so that the veins have more time to grow used to the larger load of blood, Frazee said.
28.
Furthermore, meningeal lymphatic vessels are generally smaller than those in the periphery and display an interesting structural homogeneity along the dural sinuses, remaining thinner and mostly unbranched along the superior sagittal sinus while growing larger and more branched along the transverse sinuses.
29.
At the back part and close to the upper or sagittal border is the parietal foramen, which transmits a vein to the superior sagittal sinus, and sometimes a small branch of the occipital artery; it is not constantly present, and its size varies considerably.
30.
From this protuberance the upper division of the cruciform eminence runs to the superior angle of the bone, and on one side of it ( generally the right ) is a deep groove, the sagittal sulcus, which lodges the hinder part of the superior sagittal sinus.
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