Archive image from page 399 of The development of the human. The development of the human body : a manual of human embryology . developmentofhum00mcmu Year: 1914 388 THE BRAIN The cavity of the third vesicle persists in the adult as the fourth ventricle, traversing all the subdivisions of the vesicle; that of the second, increasing but little in height and breadth, constitutes the aquaductus cerebri; while that of the first vesicle is continued into the cerebral hemispheres to form the lateral ventricles, the remainder of it constituting the third ventricle, which includes the cavity of the m
Archive image from page 399 of The development of the human. The development of the human body : a manual of human embryology . developmentofhum00mcmu Year: 1914 388 THE BRAIN The cavity of the third vesicle persists in the adult as the fourth ventricle, traversing all the subdivisions of the vesicle; that of the second, increasing but little in height and breadth, constitutes the aquaductus cerebri; while that of the first vesicle is continued into the cerebral hemispheres to form the lateral ventricles, the remainder of it constituting the third ventricle, which includes the cavity of the median portion of the telencephalon as well as the entire cavity of the diencephalon. During the differentiation of the various divisions of the brain certain flexures appear in the roof and floor, and to a certain extent 'V'i L-/ IV Z iVi 02 Fig. 233.—Median Longitudinal Section of the Brain of an Embryo of the Third Month.—(His.) correspond with those already described as occurring in the embryo. The first of these flexures to appear occurs in the region of the mid- brain, the first vesicle being bent ventrally until it comes to lie at practically a right angle with the axis of the mid-brain. This may be termed the mid-brain flexure (Fig. 232, mf) and corresponds with the head-bend of the embryo. The second flexure occurs in the region of the medulla oblongata and is known as the nape flexure (Fig. 232, nf); it corresponds with the similarly named bend of the embryo and is produced by a bending ventrally of the entire head, so
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