. Biology; the story of living things. optic lobe snake^ brates should be made for the sake of clearness. Remembering that the brain of a fish is not folded upon itself as is the brain of a mammal, it is easy to see that the introduction of flexures tends towards greater compactness. Another outstanding develop- ment is the increase in size of some of the re- gions of the brain. In lower forms, the domi- nating portions of the brain from the stand- point of mass are the optic lobes of the mid- brain and the medulla oblongata, and, as might be inferred, both the cerebrum and cere- b
. Biology; the story of living things. optic lobe snake^ brates should be made for the sake of clearness. Remembering that the brain of a fish is not folded upon itself as is the brain of a mammal, it is easy to see that the introduction of flexures tends towards greater compactness. Another outstanding develop- ment is the increase in size of some of the re- gions of the brain. In lower forms, the domi- nating portions of the brain from the stand- point of mass are the optic lobes of the mid- brain and the medulla oblongata, and, as might be inferred, both the cerebrum and cere- bellum are quite small. In the higher mammals, however, these organs become two of the most important centers in the brain, increase in the size of the cerebrum being in direct pro- portion to the intelligence of the animal. An examination of a few of the more important landmarks of the divisions of the brain in order to secure a general idea of the function- ing of each of these parts will furnish a background for the discussion of the '' Display of ; The Parts of the Vertebrate Brain The Cerebrum or Telencephalon. As the adult condition is approached, certain other characteristic structures appear. From the anterior portion of the cerebrum grow the paired olfactory lobes. In lower xertebrates these may extend into expanded olfactory Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hunter, George W. (George William), 1873-1948; Walter, Herbert Eugene, b. 1867; Hunter, George W. (George William), 1902-. New York, Cincinnati [etc. ] American book company
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