(IMAGE (TYPE "GIF") (PATH "gifs/Syllabus Chapters/Cerebellum/MRIsag.compo.gif")) (OUTLINE-COLOR (NAME "YELLOW")) (STRING-COLOR (NAME "RED")) (PIN-COLOR (NAME "RED")) (FRAME-INFO (STRING "Sagittal MRI Composite. \(Scans compliments of Dr. K. Maravilla, Dept. of Radiology, University of Washington\). These sagittal scans \(identifying numbers are in millimeters to the left of the midsagittal plane\) are from the approximate midline \(top left\) to a lateral slice through the middle cerebellar peduncle \(bottom right\). Cerebellum means \"little brain\" and these sections show clearly the difference in size between the cerebellum and cerebral hemispheres. The tentorium cerebelli overlies the superior surface of the cerebellum, separating it from the occipital and temporal lobes posteriorly. The vermis is the midline part of the cerebellum. The cerebellar hemispheres make up the large lateral mass of the cerebellum. The cerebellar tonsils lie inferiorly on each side near the medulla. In the process called \"tonsilar herniation\" an expanding lesion or mass in the posterior cranial fossa causes the tonsils to be herniated through the foramen magnum; they press against the medulla, compromising its life-sustaining functions. These sagittal slices show the cerebellar peduncles to advantage. 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