In the preceding papers of this series,1 evidence for the following propositions was adduced: The projection of the retinal quadrants and the macula on the human striate cortex can be determined from purely anatomic considerations (normal, pathologic and experimental; the geniculostriate radiation occupies the whole of the fasciculus longitudinalis inferior (external sagittal stratum) and this alone; the upper retinal quadrant is represented superiorly in the cortex and radiation, mesially in the corpus geniculatum and, in the lower quadrant, inferiorly in the cortex and laterally in the geniculate body; the representation of the macula is extensive and lies in the posterior portion of the visual area; and the existence of callosal visual fibers is improbable.
Having made so much progress, we may be encouraged to attempt an answer to the following additional questions:
1. What is the extent of the representation of the macula in the striate cortex?
2. Where