. Cunningham's Text-book of anatomy. Anatomy. Piriform area (anterior part) Insula - -Olfactory tubercle •Optic ehiasma Nucleus f~ amygdala? Rhinal fissure— Neopallium -. ^Olfactory bulb ^Olfactory tubercle -Optic ehiasma _ Nucleus amygdalae Piriform area (posterior part) Fig. 553. A, The lateral aspect of the left cerebral hemisphere of a rabbit. B, The inferior aspect of the right half of a rabbit's brain. C, The corresponding view of a human foetal brain at the fifth month. Olfactory areas, green ; neopallium, blue. excrescences; and it is whitened by a thin layer of fibres (substantia reti
. Cunningham's Text-book of anatomy. Anatomy. Piriform area (anterior part) Insula - -Olfactory tubercle •Optic ehiasma Nucleus f~ amygdala? Rhinal fissure— Neopallium -. ^Olfactory bulb ^Olfactory tubercle -Optic ehiasma _ Nucleus amygdalae Piriform area (posterior part) Fig. 553. A, The lateral aspect of the left cerebral hemisphere of a rabbit. B, The inferior aspect of the right half of a rabbit's brain. C, The corresponding view of a human foetal brain at the fifth month. Olfactory areas, green ; neopallium, blue. excrescences; and it is whitened by a thin layer of fibres (substantia reticularis alba) prolonged backwards from the stria olfactoria lateralis. By these fibres olfactory impulses are poured directly from the mitral cells of the bulb into the piriform area. If we call the olfactory nerves the primary olfactory neurones, the fibres which pass from the bulb to the piriform area would then be secondary olfactory neurones. Formatio Hippocampalis.— From all parts of the area piriformis, as well as the trigonum and tuberculum olfactorium, fibres arise (tertiary olfactory neurones), and proceed on to the medial aspect of the hemisphere, where they terminate in the edge of the pallium, alongside the lamina chorioidea. In the human brain the vast majority of these tertiary neurones proceed from the posterior extremity of the piriform area, but a certain number arise in the neighbourhood of the substantia perforata anterior and proceed at once on to the medial surface of the hemisphere. The large number of small nerve-cells that collect in the medial edge of the pallium become specially modified in structure to form a receptive organ for impressions of smell, known as the fascia dentata; and the axons of these cells pass into the pallium immediately surrounding the peripheral edge of the fascia dentata, which is known as the hippocampus (Fig. 556). In the latter area 41. Please note that these images are extracted from scanned page images that may have b
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