With these facts clearlyrecorded we may now consider the anatomy of the fourth ventricle. In the intact brain, this peduncle is very near the posterior surface of the medulla, and is separated from the inferior cerebellar peduncle only by a narrow interval. This edge is the peduncle of the flocculus. The inferior medullary velum has a thickened free edge which connects the nodule to the flocculus. 20.10 which is a sagittal section along the axis XY shown in Fig. Posteriorly, the inferior velum merges intothe white matter of the cerebellum. If the tonsil is lifted away, we see that the nodule is continuous laterally with a membrane called the inferior (or posterior) medullary velum (Fig. Immediately lateral to the nodule there is the tonsil of the cerebellum. It will be recalled that the nodule forms the anterior-most part of the inferior vermis. The lower part of the ventricle is related to the nodule (Figs. The upper part of the ventricle is related to the superior (or anterior) medullary velum. When traced inferiorly (and posteriorly) the velum merges into the white matter of the cerebellum. 20.8 will show that the cerebellum is intimately related to the ventricle. For a proper understanding of the anatomy of the fourth ventricle, it is necessary that some features of the gross anatomy of the cerebellum and of related structures be clearly understood.
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