. Cunningham's Text-book of anatomy. Anatomy. 574 THE NERVOUS SYSTEM. passes continuously round the circumference of the organ, cutting deeply into its lateral and posterior margins. In front, its lips diverge to enclose the three cerebellar peduncles as they pass into the interior of the cerebellum. The horizontal fissure divides the organ into a superior and an inferior part, which may be studied separately. In some cases it meets the corresponding fissure of the other side upon the vermis, but very often such a confluence does not occur. The folium vermis in such cases is not distinguished
. Cunningham's Text-book of anatomy. Anatomy. 574 THE NERVOUS SYSTEM. passes continuously round the circumference of the organ, cutting deeply into its lateral and posterior margins. In front, its lips diverge to enclose the three cerebellar peduncles as they pass into the interior of the cerebellum. The horizontal fissure divides the organ into a superior and an inferior part, which may be studied separately. In some cases it meets the corresponding fissure of the other side upon the vermis, but very often such a confluence does not occur. The folium vermis in such cases is not distinguished from the tuber vermis. The cerebellum is subdivided somewhat arbitrarily into a median portion termed the vermis, and two much larger lateral portions, called the lateral hemi- spheres. The demarcation between these main subdivisions of the organ is not very evident from every point of view. In front, and also behind, there is a marked deficiency or notch. The incisura cerebelli posterior ( marsupial notch) is smaller and narrower than the anterior notch. It is bounded laterally by the lateral hemispheres, whilst its bottom is formed by the axial lobe or vermis. It is occupied by a fold of dura mater, called the falx cerebelli. The incisura cerebelli anterior ( semilunar notch) is wide, and, when viewed from above, it is seen to be occupied by the inferior quadrigeminal bodies and by the brachia Mesencephalon occupying the incisura anterior Lobulus culminis Lobulus lunatus Central lobule Culmen. Postero- superior lobule Folium vermis Postero-inferior lobule Tuber vermis Incisura posterior Fig. 509.—Superior Surface of the Cerebellum. conjunctiva. As in the case of the posterior notch, its sides are formed by the lateral hemispheres and the bottom by the vermis. On the superior surface of the cerebellum there is little distinction to be noted between the median lobe and the superior surface of each lateral hemisphere. On this aspect the median lobe receives the name of
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