In a series of articles I have reported1 in detail the results of studies on the efferent fibers of the cortex of the brain of a primate (Macaca mulatta). After surgical removal of portions of the cortex the fibers arising from such an area were traced by the Marchi method2 in complete serial sections.
Avoiding the specific details of the particular investigation, several rather general observations may be emphasized.
With regard to association fibers arising from any given point and ending within the same hemisphere, it may be noted that short association fibers do not arise, as one might suppose, from a given point and spread out fountain-like to all the surrounding cortex. On the contrary, the cytologic constitution of the neighboring cortex appears to play an important part in short association connections.
If, for example, only a portion of a cytologic area is removed, it is noted
METTLER FA. CORTICIFUGAL CONNECTIONS OF THE CEREBRAL CORTEX: A RÉSUMÉ OF EXPERIMENTAL INVESTIGATIONS. Arch NeurPsych. 1936;35(6):1338–1344. doi:10.1001/archneurpsyc.1936.02260060180014
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