Brain Hemisection - Erler Zimmer

Brain Hemisection - Erler Zimmer

This 3D model represents a midsagittal hemisection through an entire brain, preserving the anatomy of the right side along with deep brain structures and spaces visible in the midline. In the lateral view, the right cerebral and cerebellar hemispheres are covered by the arachnoid mater. In the midline view, the brain regions from the cerebrum to the medulla oblongata are retained. At the center, the third ventricle is exposed, with an intact septum pellucidum positioned superiorly, partially obscuring the lateral ventricles within the cerebral hemisphere. On the lower edge of the third ventricle, you can observe both the right mamillary body and the right optic tract, while towards the rear, the cerebral aqueduct can be seen extending across the midbrain between the tectum and tegmentum toward the fourth ventricle (located between the cerebellum and pons). The cerebellum is separated from the occipital lobe by a preserved section of the tentorium cerebelli, and in cross-section, the cerebellar cortex contributes to the distinctive arbor vitae.
A set of arterial branches has been color-coded to emphasize their routes across the preserved brain structures. In the midsagittal view, the anterior cerebral artery courses around the corpus callosum to supply the cingulate gyrus and other midline cortical regions. The base of the middle cerebral artery can be observed as it passes deeply between the temporal and frontal lobes, with the posterior communicating artery connecting it to a small remnant of the posterior cerebral artery. Adjacent to the posterior cerebral artery is the superior cerebellar artery, extending laterally to pass between the temporal lobe and the cerebellum before diving deep into the transverse fissure.