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Additional Motor Area and Cortical Autonomic Regulator

This study was made to explore a cortical region that developed to a high degree in animals which are dependent upon large olfactory connections. The cingulate gyrus has remained a sizeable cortical convolution in primates and a few other mammals in which the olfactory pathways are small o r vestigial. This gyms (fig. 1, A) encircles the subdivisions of the corpus callosum, extending from the sulcus of the corpus callosum to the sulcus cinguli. The anterior portion of the gyrus (Walker-Brodmann areas 24, 25 ; Walker, '40) contains agranular cortex (Rose and Woolsey, '48) similar to the motor area of the precentral gyrus. The authors just quoted described the posterior portion of the gyrus (areas 23, 29 and isthmus) as possessing granular cortex similar to the sensory area of the postcentral gyrus.