The anatomy of the nervous system, from the standpoint of development and function . actory gyrus is also obscure. According to Elliol Smith (1915),the rudiment of the hippocampal formation that develops on the medial surface beginsin front alongside the place where the stalk of the olfactory peduncle (which becomes thetrigonum olfactorium) is inserted; it passes upward to the superior end of the Lamina tcrmi-nalis, from the rest of which it is separated by a triangular mass of gray matter called thecorpus paraterminale I Fig. 2(H)). This description, as well as the figure which accompaniesil,
The anatomy of the nervous system, from the standpoint of development and function . actory gyrus is also obscure. According to Elliol Smith (1915),the rudiment of the hippocampal formation that develops on the medial surface beginsin front alongside the place where the stalk of the olfactory peduncle (which becomes thetrigonum olfactorium) is inserted; it passes upward to the superior end of the Lamina tcrmi-nalis, from the rest of which it is separated by a triangular mass of gray matter called thecorpus paraterminale I Fig. 2(H)). This description, as well as the figure which accompaniesil, suggests a close relation between the rostral end of the hippocampal rudiment and whatis ordinarily known as the medial olfactory gyrus. The subdivision of the olfactory lobeinto anterior and posterior portions by the morphologically unimportant sulcus parolfactorius posterior, although adopted in the B. N. A., is without justification and leads onlyto confusion (Elliot Smith, 1907). Olfactory bulb Lateral olfactory gyrus (stria) Posterior parolfactory sulcus A mygdaloid nucleus. Medial olfactory gyrus (stria)Olfactory tract Limen insula Anterior perforated substance Hippocampal gyrus Fig. 198.—Brain of a human fetus of cm. Ventral view. (Retzius, Jackson-Morris.) Between the olfactory trigone and the medial olfactory gyrus, on the onehand, and the optic tract on the other, is a depressed area of gray matter knownas the anterior perforated substance, through the openings in which numeroussmall arteries reach the basal ganglia (Figs. 172, 197). The part immediatelyrostral to the optic tract forms a band of lighter color, known as the diagonalgyrus of the rhinencephalon or the diagonal band of Broca (Fig. 197). Thiscan be followed on to the medial surface of the hemisphere, where it is continuedas the paraterminal body or subcallosal gyrus (Fig. 200). Rostral to this gyrusthe hippocampal rudiment, which corresponds in part to the parolfactory areaof Broca, extends as a na
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