![]() ![]() ![]() ![]() The same principle holds for the base of the skull, where the presence of many structures can make pathologic lesions easy to overlook. A stroke is a serious life-threatening medical condition that happens when the blood supply to part of the brain is cut off. Diffusion-weighted magnetic resonance imaging (MRI) is often useful in identifying such lesions, not because the lesion is diffusion restricted, but because all the other structures are often low in signal, making the lesion conspicuously bright. Please note there is volume averaging of cortical veins with the top of the calvaria such that the veins artifactually appear to be within the bone rather than within the cranial vault (see Brain Coronal 2 ).Ī lesion, such as a metastatic lesion in the marrow, can often be missed at the vertex (vertex cranii). Note the first cranial nerves, the olfactory nerves, in the olfactory grooves along the medial inferior floor of the anterior cranial fossa. In particular, exercise enhances potentiation in response to theta 11 and high-frequency 9, 12 stimulation, and reduces the threshold of theta stimulation. The vein of Trolard anastomoses with the middle cerebral vein and the superior sagittal sinus. TheBrain is a true native application on Windows, macOS, iOS and Android, optimized for the OS-specific features of each platform. Named after the French anatomist Paulin Trolard (1842–1910) and also known as the superior anastomotic vein, the vein of Trolard is the largest cortical vein at the convexity (see also Brain Coronal 15 ). Web attachments appear right inside TheBrain 9, letting you access web information without even having to open it in a separate browser.
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