. The anatomy of the central nervous system of man and of vertebrates in general. Neuroanatomy; Central Nervous System. DEVELOPMENT OF THE BRAIN AND GANGLIA. 53 well defined, it has the form shown in Fig. 23. It has grown out pos- teriorly and has also bent ventrally. Where, within the cerebral cavity, the corpus striatum is developing the outer wall is less expanded than in the other parts of the cerebrum. In that place a relative retardation of the growth of the cerebral wall leaves a deep fissure, the Fossa Sylvii. A frontal lohe, an occipital lohe, and a parietal loie may now be easily dis
. The anatomy of the central nervous system of man and of vertebrates in general. Neuroanatomy; Central Nervous System. DEVELOPMENT OF THE BRAIN AND GANGLIA. 53 well defined, it has the form shown in Fig. 23. It has grown out pos- teriorly and has also bent ventrally. Where, within the cerebral cavity, the corpus striatum is developing the outer wall is less expanded than in the other parts of the cerebrum. In that place a relative retardation of the growth of the cerebral wall leaves a deep fissure, the Fossa Sylvii. A frontal lohe, an occipital lohe, and a parietal loie may now be easily distinguished upon the hemispheres. That part of the hemispheres below the Sylvian fossa is called the temporal lole. The hemispheres are still hollow within and the ventricular cavities conform naturally to the general cerebral form. Those parts of the ven- tricle which extend into the frontal, occipital, and temporal lobes have been called the anterior, posterior, and inferior horns, respectively. At this stage of development the median wall of the hemisphere demands our. Fig. ^Tlie brain of a human foetus of the fourtli month. especial interest. As before mentioned, its ventral margin passes into the epithelium of the plexus chorioideus. This is the case also when the wall bends down with the temporal lobe. From the base of the lamina terminalis to the apex of the temporal lobe, the sickle-shaped fornix locates this margin. In the anterior part of the brain the corpus callosum is developed dorsal to the fornix. The commissural fibers of which the corpus callosum is composed determine a surface which forms an acute angle with the fornix (see Fig. 24). That portion remaining between corpus callosum and fornix, and which consists of the two thin laminge of the primitive hemispherical division- wall (primdre scheidewand. Fig. 22) is called the septum pellucidum. These are important structures, which should be carefully studied in the accom- panying figures. Note carefully the a
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