. The first [-fifth] reader of the school and family series. entirely Fig. 5. Fig. 5 represents an internal raTERNAl SIDE VIEW OP THE BEAW. f^^. ^^^^V of the light half of the brain — the brain being cut orsplit doiran-ard from the whitebody in the centre. At 1 is shownthe half of the medulla oblonga-ta ; 4 points to what is calledthe arbor viice^ or • tree of life,of the cerebellum; 20 points tothe origin of one of the ner\-es thatmove the eyes: and 21 to the or-igin of the optic nerve, which ispeen proceeding toward the eye;?26 points to what here appearsas a crescent-shaped white sub-stance
. The first [-fifth] reader of the school and family series. entirely Fig. 5. Fig. 5 represents an internal raTERNAl SIDE VIEW OP THE BEAW. f^^. ^^^^V of the light half of the brain — the brain being cut orsplit doiran-ard from the whitebody in the centre. At 1 is shownthe half of the medulla oblonga-ta ; 4 points to what is calledthe arbor viice^ or • tree of life,of the cerebellum; 20 points tothe origin of one of the ner\-es thatmove the eyes: and 21 to the or-igin of the optic nerve, which ispeen proceeding toward the eye;?26 points to what here appearsas a crescent-shaped white sub-stance, called the corpus appears to be the peculiar officeof the ccrebeUum to direct, com-bine, and control mu?calar mo-tions; and those animals whichhave it the most fully developedexcel in their powers of motion,and nre distinguished by the com-plication of their movements. Ifremoved by degrees, in success-ive slices, the motions of the ani-mal become irregular, and, finally, It loses all power of walking or of maintaining its 92 WILLSON S FIFTH READER. Part III. different, there is somctliing about them which -wc do not yetunderstand. Nor can we understand Jioio the mind receivesimiDressions through one set, and sends out messages andcauses motion through another, for this Avoukl be to mider-stand hoto mind acts upon matter, and hoxo the spiritual isconnected with the material world. 10, But there is one thing more about the brain which wemay explain here. We have said that the central part of itis of a white color, and composed of the beginnings of theminute nerve tubes which we have described. Bnt all aroundthis white inner part is a thick layer of gray substance,thickly lining the interior of all the convolutions or folds ofthe brain; and this gray substance is comjTOsed of minutecells^ intermingled with which are exceedingly minute andnumerous blood-vessels, which supply the cells with their req-uisite nourishment. This cellular substance of the
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Keywords: ., bookcentury1800, bookdecade1860, bookpublishernewyo, bookyear1860
