. The brain as an organ of mind. Brain; Thought and thinking; Brain. Chai'. IX.] AND OF BIRDS. 127 cf higher Yertehrates (fig. 58, h). Between the optic lobes and the next great division of the brain, the cerebral lobes, we find the so-called ' pineal body' (fig. 61, j), projecting upwards, and in a more developed form than that W'hich is met with in Fishes. The nature and uses of this body are wholly unknown. It is chiefly notorious from the fact that Descartes pointed to the corresponding structure in the human brain as the '^ seat of the ; The Cerebral Lobes in the Lizard (fig. 59
. The brain as an organ of mind. Brain; Thought and thinking; Brain. Chai'. IX.] AND OF BIRDS. 127 cf higher Yertehrates (fig. 58, h). Between the optic lobes and the next great division of the brain, the cerebral lobes, we find the so-called ' pineal body' (fig. 61, j), projecting upwards, and in a more developed form than that W'hich is met with in Fishes. The nature and uses of this body are wholly unknown. It is chiefly notorious from the fact that Descartes pointed to the corresponding structure in the human brain as the '^ seat of the ; The Cerebral Lobes in the Lizard (fig. 59) and its allies, as well as in Amphibia, are, in comparison with other parts of the brain, much larger than in Fishes. This is due only in part to an absolute increase in their development, as there seems to be some diminution in the size of the olfactory and optic lobes and the cerebellum. In Serpents, Crocodiles, Tur- tles (fig. 61), and their allies, however, we meet with a decided absolute increase in the size of the cerebral lobes. In Crocodiles, for instance, they are much larger and broader than other parts of the brain, though their surface is still quite smooth. Each lobe contains a cavity or ' ventricle ' in its interior, as in some of the higher Fishes. larger, and, projecting from its anterior (Owen.) and inner surface there is a rounded emi- nence, supposed by some anatomists to represent a body of considerable importanceâwhich is known amongst higher vertebrates as the ' Corpus Striatum' or striate body. Each Cerebral Lobe is connected with its corresponding optic lobe and with the same half of the medulla oblongata, by means of a thick and composite prolongation called the. Fig. 59.âBrain of Lizard [Lacerta, viri- cUs). a, Cerebral hemispheres; b, op- tic loloes; c, cerebel- lum ; d, spinal cord ; e, fourth ventricle ; But in Reptiles the ventricle is â¢^' p^"'^^ body; gr. â â¢â¢ olfactory Please note that these images are extracted from
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