. The Journal of comparative neurology and psychology. Fig. 41. Pig embryo, 15 mm. Three sections from a frontal series showingthe relations of the chorioid fissure and plexus to the lateral hemisphereand the thalamus. The section to the left is the most ventral, that to theright the most dorsal. velum transversum by the paraphysal arch. From this stage on theplexus grows rapidly and becomes very large and in the medianregion both the velum and the paraphysal arch become involved in Johnston, Forehrain Vesicle in Vertebrates. 503 the plexus and their identity is lost. If the paraphysis is
. The Journal of comparative neurology and psychology. Fig. 41. Pig embryo, 15 mm. Three sections from a frontal series showingthe relations of the chorioid fissure and plexus to the lateral hemisphereand the thalamus. The section to the left is the most ventral, that to theright the most dorsal. velum transversum by the paraphysal arch. From this stage on theplexus grows rapidly and becomes very large and in the medianregion both the velum and the paraphysal arch become involved in Johnston, Forehrain Vesicle in Vertebrates. 503 the plexus and their identity is lost. If the paraphysis is to be foundin adult mammals it should be looked for in the chorioid plexus inthe middle line between the interventricular foramina. The mem-braneous roof extending forward from the paraphysal arch to meetthe lamina terminalis is relatively long in the embryo, spanning thewide opening into the lateral ventricles. In later development theseinterventricular foramina grow much less rapidly than the hemi-spheres and the roof in question becomes of insignifica
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