. The brain from ape to man; a contribution to the study of the evolution and development of the human brain. Brain; Evolution; Pongidae. 42 THE LOWER PRIMATES The pyramidal bundles forming this decnssation arc relatively narrow, in this respect bearing out the impression gained from the surface relief of the pyramid which indicates a limited capacity for volitional control over. FIG. 22. LEMUR MONGOZ. LEVEL OF THE PYRAMIDAL DECUSSATION. CB, Column of Burdach; cen. Central Gray Matter; CG, Column of Goll; dt, Deiterso-spinal Tract; fle. Dorsal Spinocerebellar Tract; cow, Ventral Spinocerebella
. The brain from ape to man; a contribution to the study of the evolution and development of the human brain. Brain; Evolution; Pongidae. 42 THE LOWER PRIMATES The pyramidal bundles forming this decnssation arc relatively narrow, in this respect bearing out the impression gained from the surface relief of the pyramid which indicates a limited capacity for volitional control over. FIG. 22. LEMUR MONGOZ. LEVEL OF THE PYRAMIDAL DECUSSATION. CB, Column of Burdach; cen. Central Gray Matter; CG, Column of Goll; dt, Deiterso-spinal Tract; fle. Dorsal Spinocerebellar Tract; cow, Ventral Spinocerebellar Tract; nr, Nucleus of Rolando; pv. Pyramidal Tract, Pyramidal Fibers; pvx. Pyramidal Decussation; ref, Reticular Formation; rst. Rubrospinal Tract; SPT, Spinothalamic Tract; trd. Descending Trigeminal Tract; ven, Ventral Gray Matter. [Accession No. 147.* Section 57. Actual Size, 9X5 mm. In all actual measurements fractions of the millimeter have been disregarded.] the animal's voluntary muscles. As a corollary it may be inferred that the small pyramidal system bespeaks a small ability on the part of the animal to acquire learned reactions. From observation of lemurs in captivity, it is apparent that they learn little more, either by imitation or repetition, than in the free state. *The numbers mentioned at the end of each caption in this and the following cross sections refer to the Study Collection of the Columbia University Neurological 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 Tilney, Frederick, 1875-1938; Riley, Henry Alsop, 1887-. New York, P. B. Hoeber, inc.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbrain, booksubjectevo
