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(FRAME-INFO (STRING "Horizontal MRI Composite. \(Scans compliments of Dr. K. Maravilla, Dept. of Radiology, University of Washington\). These scans \(identifying numbers are in millimeters ventral to a plane through the anterior-posterior commissure line\) show a series of horizontal slices progressing ventrodorsally through the brainstem from the pontomedullary junction \(top left\), to the pontine isthmus \(bottom right\). The cerebellum sits posteriorly in the posterior cranial fossa, separated from the cerebral hemispheres by the tentorium cerebelli \(not shown\). The connection between the brainstem and cerebellum via the cerebellar peduncles \(inferior, middle and superior\) is especially well-displayed here. Note the prominent fourth ventricle."))
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