期刊
CEREBRAL CORTEX
卷 23, 期 5, 页码 1126-1147出版社
OXFORD UNIV PRESS INC
DOI: 10.1093/cercor/bhs088
关键词
area DA; corticocortical connections; dorsomedial area; primate; ventrolateral posterior area
资金
- National Science Foundation [IOS-0848106]
- National Eye Institute at the National Institutes of Health [R01 EY015262, EY019743]
- Research to Prevent Blindness, Inc.
The primate visual cortex consists of many areas. The posterior areas (V1, V2, V3, and middle temporal) are thought to be common to all primate species. However, the organization of cortex immediately anterior to area V2 (the third tier cortex) remains controversial, particularly in New World primates. The main point of contention has been whether the third tier cortex consists of a single area V3, representing lower and upper visual quadrants in dorsal and ventral cortex, respectively, or of 2 distinct areas (the dorsomedial [DM] area and a V3-like area). Resolving this controversy is crucial to understand the function and evolution of the third tier cortex. We have addressed this issue in marmosets, by performing high-precision mapping of corticocortical connections in cortex bordering dorsal V2. Multiple closely spaced neuroanatomical tracer injections were placed across the full width of dorsal V2 or adjacent anterior cortex, and the location of resulting labeled cells mapped throughout whole flattened visual cortex. The resulting topographic patterns of labeled connections allowed us to define areas and their boundaries. We found that a complete representation of the visual field borders dorsal V2 and that the third tier cortex consists of 2 distinct areas. These results unequivocally support the DM model.
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