. Kirkes' handbook of physiology . t that the occipital lobe, figures 412, 413, andparticularly the cuneus, is concerned as a visual center, since not only is itconnected with the optic nerves, as we have seen, but also because the re-moval of the right occipital lobe in an animal (monkey) is followed by lefthemiopia, removal of the left by right hemiopia, and removal of both occipitallobes by total blindness. Olfactory Center in the Cortex. The olfactory nerve differs from 586 THE NERVOUS SYSTEM the other cranial nerves. In reality it is a representative of the olfactory lobesof other animals
. Kirkes' handbook of physiology . t that the occipital lobe, figures 412, 413, andparticularly the cuneus, is concerned as a visual center, since not only is itconnected with the optic nerves, as we have seen, but also because the re-moval of the right occipital lobe in an animal (monkey) is followed by lefthemiopia, removal of the left by right hemiopia, and removal of both occipitallobes by total blindness. Olfactory Center in the Cortex. The olfactory nerve differs from 586 THE NERVOUS SYSTEM the other cranial nerves. In reality it is a representative of the olfactory lobesof other animals, which are part of the cerebrum. The olfactory lobe origi-nates as an offshoot from the cerebral vesicle, the front part of which is de-veloped into the bulb of the olfactory nerve, while the back part forms itspeduncle. The nerve, the cavity of which in man is filled up in the fully de-veloped condition with neurogliar substance, lies upon the cribriform plateof the ethmoid bone, and is contained in a groove on the under surface. Fig. 416.—Scheme of the Central Connections of the Optic Fibers. (Cunningham.) of the frontal lobe. On examination of the bulb it is found to be thus madeup: Beneath the neurogliar layer is a layer of longitudinal fibers and a fewnerve cells next to this is a layer of small cells, nuclear layer, fibers from thelayer of nerve fibers passing through it. The nuclear layer is also separated into groups of cells by an interlacingof the fibers. The next layer is thick and is composed of neuroglia and nervefibers, some of which are medullated, as well as of cells more or less pyramidalin shape. Below this layer is the layer of olfactory glomeruli. These glomer-uli are small synapses of olfactory fibers. The larger also includes small TASTE CENTER OF THE CORTEX 587 cells and granular matter. A full description of the anatomy of these partsis given later. Fibers of the olfactory nerve proper are found below this layer, and passthrough the crib
Size: 1185px × 2108px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectphysiology, bookyear1
