The anatomy of the nervous system, from the standpoint of development and function . I ig 218.—Diagram showing the differences in thickness and in the arrangemenl (if t In- lighterami darker bands in the human cerebral cortex in different regions as seen with the naked eye:.1, Motor cortex from anterior central gyrus; B, sensory cortex from the posterior central gyrus;(, \isiial cortex from the region of the calcarine fissure; D, auditory cortex from the anteriortransverse temporal gyrus. (Redrawn after Elliot Smith.) to 28), and late (Nos. 28 to 36). According to Flechsig, the primary areas,w
The anatomy of the nervous system, from the standpoint of development and function . I ig 218.—Diagram showing the differences in thickness and in the arrangemenl (if t In- lighterami darker bands in the human cerebral cortex in different regions as seen with the naked eye:.1, Motor cortex from anterior central gyrus; B, sensory cortex from the posterior central gyrus;(, \isiial cortex from the region of the calcarine fissure; D, auditory cortex from the anteriortransverse temporal gyrus. (Redrawn after Elliot Smith.) to 28), and late (Nos. 28 to 36). According to Flechsig, the primary areas,which are myelinated at birth, are projection centers and receive the sensoryradiation from the thalamus; while the other parts of the cortex, not being pro-vided with projection fibers, serve only as association centers. He believed that. Fig. 219.—Lateral view of the human cerebral hemisphere, showing the cortical areas asoutlined by Flechsig on the basis of differences in the time of myelination of their primary areas (first to become well myelinated) are cross-hatched; the intermediate areindicated by vertical lines; the late areas are unshaded. (Lewandowsky.) myelination of nerve-fibers takes place in the order of conduction, that is, thesheaths are developed first on the afferent fibers, reaching the cortex from thethalamus, and later on the association fibers, linking the various areas to this conception fibers of like function tend to become myelinated19 290 THE NERVOUS SYSTEM at the same time. Much of Flechsigs work has failed to stand the test of rigidexamination. It is now known that practically all regions of the cortex, in-cluding those designated by him as association centers, are connected with thethalamus or lower lying centers by afferent or efferent projection fibe
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