. Journal of comparative neurology . Fig. 81 Pig embryo, 50 mm. Rapid development of the anterior pallial com-missure has produced a condition very similar to that of the adult bat. Thecommissure still occupies the lamina supraneuroporica but also extends forwardfrom its dorsal border to form a crescent. Above the crescent is seen the indu-sium in a condition very much like that of the hippocampal formation in theopossum or bat. I can find no indication of secondary fusion. The rostral limbof the commissure is formed simply by the invasion and stretching of the dorsalborder of the lamina supra
. Journal of comparative neurology . Fig. 81 Pig embryo, 50 mm. Rapid development of the anterior pallial com-missure has produced a condition very similar to that of the adult bat. Thecommissure still occupies the lamina supraneuroporica but also extends forwardfrom its dorsal border to form a crescent. Above the crescent is seen the indu-sium in a condition very much like that of the hippocampal formation in theopossum or bat. I can find no indication of secondary fusion. The rostral limbof the commissure is formed simply by the invasion and stretching of the dorsalborder of the lamina supraneuroporica by additional corpus callosum fibers. SEPTUM, HIPPOCAMPUS, PALLIAL COMMISSURES 473. Figs. 82 to 90 Diagrams to illustrate the relations of the hippocampus, hippo-campal primordium and paraterminal body. The medial surface of the righthemisphere is drawn in each case. The paraterminal body is shaded with hori-zontal lines, the hippocampal primordium is distinguished by means of spindle-shaped spots or flecks and the hippocampus is in solid black. The commissuresare merely outlined with pen lines. All the diagrams except those of the batand the bear are drawn from dissections. Fig. 82 Diagram of the brain of a reptile to illustrate the relations of hippo-campus and paraterminal body as defined by Elliot Smith. The outline is takenfrom the turtles brain. Herrick recognizes that the narrow ridge over the fora-men in the turtle is primordium hippocampi but describes a much larger supra-foraminal portion of the paraterminal body in lizards. Fig. 83 Diagram of the brain of the rat similar to the last. The wholecommissural system is supposed to be imbedded in the paratermina
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmedicine, bookyear191
