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The Surface of the Left Cerebral Hemisphere, Cerebellum,and Medulla Oblongata.

The Surface of the Left Cerebral Hemisphere, Cerebellum.jpg The Body of a Motor NeuroneThumbnailsHorizontal Section through the Right EyeThe Body of a Motor NeuroneThumbnailsHorizontal Section through the Right EyeThe Body of a Motor NeuroneThumbnailsHorizontal Section through the Right Eye

Sensory areas are enclosed by broken lines; certain centres in the association-zones are marked by dots. The sensory area of smell is on the inner aspect of the brain; so also is the area of vision which borders the calcarine and retrocalcarine fissures, and only rarely extends on to the external surface, as shown in the diagram. The sensory area of hearing is largely hidden within the fossa of Sylvius, the opening into which is indicated by the dark line above it. The kinæsthetic-sensory areas for the various muscles of the body occupy the territory between the dotted line in front and the bottom of the fissure of Rolando behind. They do not extend on to the posterior wall of this fissure. It is impossible at present to define the boundaries of any of the centres in the association-zones.