Human anatomy, including structure and development and practical considerations . factory gyrus above mentioned. The anterior perforated space (substantia perforata anterior) is an irregularlytriangular area (Fig. 993) Iving behind the trigonuni olfactorium, from which it isseparated by the obliquely coursing sulcus parolfactorius posterior, and in front ofthe optic commissure. Its inner part is narrow and extends as a point between themesial root of the olfactory tract and the lower end of the subcallosal gyrus. Itsbroader outer part extends into the floor of the stem of the Sylvian fissure a
Human anatomy, including structure and development and practical considerations . factory gyrus above mentioned. The anterior perforated space (substantia perforata anterior) is an irregularlytriangular area (Fig. 993) Iving behind the trigonuni olfactorium, from which it isseparated by the obliquely coursing sulcus parolfactorius posterior, and in front ofthe optic commissure. Its inner part is narrow and extends as a point between themesial root of the olfactory tract and the lower end of the subcallosal gyrus. Itsbroader outer part extends into the floor of the stem of the Sylvian fissure andbehind reaches the deeper part of the uncus and, more medially, the optic designation as perforated is justified by the large number of small oval aperturesfor the transmission of perforating branches from the antero-niesial and antero-lateral groups of the basal arteries. These openings, most numerous along thefront margin of the space, are disposed with some regularity in parallel rows and 73 Rostrum ofcorpus callosum Septum lucidum Sulcus parolfactorius auterior. ^oranien ofMonro Anterior i)illarof fornixAnteriorcommissure _^^_ Lamina cinerea y / Sulcus parolfactorius posteriorGyrus subeallosus Portion ot mesial surface of right hemisphere, showinjand parolfactory area. gyrus subeallosus II54 HIM AN AXATONH decrease in size as they approach tlie inner hurder ( Foville). The substance ofthe space proper consists of a thin sluet of j;ray matter containing groups ofnerve-cells, some of which constitute the nuclei of primary centres interjwsed inthe paths connecting the olfactory lobe with the secondary (cortical) olfactorycentres (page 1222). In addition to the white strands of nerve-fibres composingthe olfactory stride which after a longer or shorter superficial course sink into thesubstance of the perforated space, an obliquely directed narrow ribbon-like tract,the diagonal band 0/ Broca, may be sometimes made out along the inner marginof the area perforata. In fr
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