VISUAL AREAS I AND II OF CEREBRAL CORTEX OF RABBIT

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Abstract
The cathode ray oscillograph and photic stimulation were used to study the projection of the visual field of the rabbit upon the cerebral cortex. The cortical area of the rabbit which responds with typical surface-positive waves to gross contralateral photic stimulation extends about 15 mm. anterior to the occipital margin of the hemisphere. Its medial border is at the splenial sulcus or 1-2 mm. medial to the sulcus and its lateral border is about half way down the lateral surface of the brain. The portion of the visual area which responds to gross ipsilateral photic stimulation is in the form of a band extending diagonally from the anteromedial to the posterolateral portion of the visual area. The vertical meridian for binocular vision is situated 20[degree] from the sagittal plant of the visual field of the deeply anesthetized animal and when projected on the cortex it divides the binocular area into approx. equal parts. The visual area anterolateral to this line shows a pattern on localized photic stimulation reserrrbling a mirror image, on a smaller scale, of the visual area which lies posteromedial to this line. The larger posteromedial area has been designated visual area I and the smaller anterolateral area visual area II. The horizontal meridian projects close to the posterior edge of the dorsal surface of the cerebrum except for a marked anteromedial dip along the vertical meridian for binocular vision. The upper visual field is represented to about 15[degree] above the horizontal meridian and the lower visual field to more than 20[degree]. The lateral visual field has been found to be represented to more than 150c from the sagittal plane in both visual area I and visual area II. The responses obtained from visual areas I and II under deep anesthesia were similar in form, amplitude, and latency.
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