. A laboratory manual and text-book of embryology. Embryology. THE BEAIN 343 thalamus of the diencephalon and in development is closely connected with it, although the thalamus forms always a separate structure. The corpus striatum elongates as the cerebral hemisphere lengthens, its caudal portion curving around to the tip of the inferior horn of the lateral ventricle and forming the slender tail of the caudate nucleus (Fig. 331). The thickening of the corpus striatum is due to the active proliferation of cells in the ependymal layer which form a prominent mass of mantle layer cells. Nerve lib
. A laboratory manual and text-book of embryology. Embryology. THE BEAIN 343 thalamus of the diencephalon and in development is closely connected with it, although the thalamus forms always a separate structure. The corpus striatum elongates as the cerebral hemisphere lengthens, its caudal portion curving around to the tip of the inferior horn of the lateral ventricle and forming the slender tail of the caudate nucleus (Fig. 331). The thickening of the corpus striatum is due to the active proliferation of cells in the ependymal layer which form a prominent mass of mantle layer cells. Nerve libers to and from the thalamus to the cere- bral cortex course through the corpus striatum as lamina; which are arranged in Anterior horn Nucleus caiidatus Interventricular foramen Third ventricle Chorioid plexus of lal. ventricle Posterior horn. Lenticular nucleus Ant. columns of font ix Internal capsule Thalamus Hippocampus Fig. 332.—Horizontal (coronal) section through the fore-brain of a 16 cm. fetus (His). the form of a wide V, open laterally, when seen in horizontal sections. This V- shaped tract of white fibers is the internal capsule, the cranial limb of which partly separates the corpus striatum into the caudate and lenticular nuclei (Fig. 332). The caudal limb of the capsule extends between the lenticular nucleus and the thalamus. The thalamus and corpus striatum are separated by a deep groove until the end of the third month (Fig. 329). As the structures enlarge, the groove between them disappears and they form one continuous mass (Fig. 332). According to some investigators, there is direct fusion between the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Prentiss, Charles William, 1874-1915. Philadelphia, London, W. B. Saunders
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