. Animal biology; Human biology. Parts II & III of First course in biology. Biology. 124 HUMAN BIOLOGY shallow or slow until carbon dioxid accumulates again. The Four Kinds of Nerve Action and the Centers that con- trol them. — The cord controls chiefly reflex action ; the medulla controls chiefly automatic action ; the cerebellum controls chiefly coordinate, or harmonizing, action; the cere- brum controls the purely vol- untary acts, for it is the seat of consciousness and thought. The medulla, like the cord, has the gray matter on the inside (Fig. 109). Structure of the Cere-. FlG. 112.—
. Animal biology; Human biology. Parts II & III of First course in biology. Biology. 124 HUMAN BIOLOGY shallow or slow until carbon dioxid accumulates again. The Four Kinds of Nerve Action and the Centers that con- trol them. — The cord controls chiefly reflex action ; the medulla controls chiefly automatic action ; the cerebellum controls chiefly coordinate, or harmonizing, action; the cere- brum controls the purely vol- untary acts, for it is the seat of consciousness and thought. The medulla, like the cord, has the gray matter on the inside (Fig. 109). Structure of the Cere-. FlG. 112.—SENSORY AND MOTOR FIBERS. (Jegi.) bellum. - The cerebellum, like the cerebrum, has the gray matter or cells on the outside. The gray matter is folded into furrows that are not nearly so winding as the folds in the cerebrum (see Fig. 115). The fibers going to the surface cells have a branched arrange- ment called the arbor vita, or tree of life, which is shown where the cerebellum is 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 Bailey, L. H. (Liberty Hyde), 1858-1954. New York, The Macmillan Co.
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