. Anatomy, descriptive and applied. Anatomy. THE CEREBELLUM 885 lodges the cerebellar falx, separates the hemispheres as tliese project beyond the inferior vermis. ?^rhe cerebellum is arbitrarily subdivided into a medial segment, the vermis or worm, from its annulated appearance, and two lateral portions, commonly called the cerebellax "; The vermis may, according to the aspect in which it is viewed, be divided into the superior vermis or prevermis on the upper or cephalic surface, and the inferior vermis or postvermis on the inferior or caudal aspect. The superior vermis
. Anatomy, descriptive and applied. Anatomy. THE CEREBELLUM 885 lodges the cerebellar falx, separates the hemispheres as tliese project beyond the inferior vermis. ?^rhe cerebellum is arbitrarily subdivided into a medial segment, the vermis or worm, from its annulated appearance, and two lateral portions, commonly called the cerebellax "; The vermis may, according to the aspect in which it is viewed, be divided into the superior vermis or prevermis on the upper or cephalic surface, and the inferior vermis or postvermis on the inferior or caudal aspect. The superior vermis is hardly distinguished from the adjacent sloping surfaces of the hemispheres; occasionally a slight furrow exists on either side. Ordinarily the term is to be restricted to the high median elevation usually called the mon- ticulus cerebelli. The inferior vermis is more distinctly bounded by a deep fissure, the sulcus valleculae, on each side, separating it from the corresponding lateral hemisphere. Among the many fissures which traverse the surface of the cerebellum, one is particularly conspicuous as a deep cleft which may be traced along the dorso- lateral margin from the dorsal notch to the point of entrance of the cerebellar Post-noclular Jis. Great zontal pyramidal fissure. ? valvulse. Fig. 654.—Under surface of the cerebellu (Schafer.) peduncles. This is the peduncular sulcus or great horizontal sulcus (sulcus horizon- talis cerebelli), and it divides the cerebellum into a cephalic or upper and caudal or lower part. The sulcus is usually quite deep in the hemispheral portion, but it frequently fails to traverse the vermis. Other deep fissures demarcate the lobes or major subdivisions of the intricately convoluted surface of the cerebellum. Conventionally the lobes and fissures or sulci are described upon the "upper" and "lower" surfaces respectively, and this mode of description is partially adhered to here. A better idea of the topographic
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1913
