Neocortical interconnections in the cat.

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Abstract
Neocortical interconnections in the cat were studied electrophysiologically after removal of the thalamus and other deep structures by suction to avoid equivocation concerning mediation of the observed projections by subcortical structures. The major projection systems thus revealed include: projections from visual cortex to "association" areas in suprasylvian, anterior lateral and sigmoid gyri, to the dorsal margin of ectosylvian (auditory) cortex, and to orbital gyrus, converging inputs to orbital gyrus from primary visual, auditory and somatosensory cortex, projections to pericruciate cortex (predominately to anterior sigmoid gyrus) from visual, somatosensory and possible auditory cortex, and from suprasylvian and lateral gyrus (association" cortex, as well as from orbital gyrus. The latter area was found to project most of somatomotor cortex. Several cortical regions, including orbital, ectosylvian, anterior suprasylvian and anterior sigmoid gyri, appear to receive multiple cortico-cortical inputs. Areas from which no efferent projections could be detected in these preparations include pericruciate (motor) cortex, most of suprasylvian gyrus, and the ventral part of ectosylvian gyri.