. The animals and man; an elementary textbook of zoology and human physiology. Zoology; Physiology. Fig. 179 A. Central or- gans of the nervous sys- tem. F. T. O., frontal, temporal and occipital lobes of the cerebrum; C, cerebellum; P, pons varo- lii; mo, medulla oblon- gata; ms-ms, upper and lower limits of the spinal cord; CVIII, 8th cervi- cal nerve; DXII, 12th dorsal nerve. (Quain after Bourgery.) THE ANIMALS AND MAN cavities of the vertebrae. Both brain and spinal cord are further protected by three membranes of connective tis- sue. Of these the dura mater is the tough outer coat. The pi
. The animals and man; an elementary textbook of zoology and human physiology. Zoology; Physiology. Fig. 179 A. Central or- gans of the nervous sys- tem. F. T. O., frontal, temporal and occipital lobes of the cerebrum; C, cerebellum; P, pons varo- lii; mo, medulla oblon- gata; ms-ms, upper and lower limits of the spinal cord; CVIII, 8th cervi- cal nerve; DXII, 12th dorsal nerve. (Quain after Bourgery.) THE ANIMALS AND MAN cavities of the vertebrae. Both brain and spinal cord are further protected by three membranes of connective tis- sue. Of these the dura mater is the tough outer coat. The pia mater is the delicate inner membrane. This is closely applied to the surface of the brain and spinal cord following all the fissures. It is vascular, that is, it contains the blood-vessels which supply the cells of nervous tissue with blood and oxygen and remove waste. Between the dura mater and the pia mater is an iimer coat, the arachnoid membrane. This membrane contains large spaces filled with a fluid (the cerebrospinal fluid). This, like the serous fluids surrounding the heart and lungs, is a protective fluid. Structure of the brain (fig. 179 A and fig. 179 B).—Like the brain of the cat (see page 67) the human brain consists primarily of three parts, the fore brain, mid brain, and hind brain. The fore brain or cerebrum is large and conspicuous. It comprises nine-tenths of the brain's bulk and almost completely covers the other parts. This disproportion in size gives some indication of its very great importance as compared with that of the other parts. The cerebrum is characterized by many convolutions. Seen from above its right and left halves (hemi- spheres) are separated from each other. 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 Kellogg, Vernon L. (Vernon Lyman), 1867-1937; McCracken, Mary I
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