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Cerebral Cortex Advance Access originally published online on November 23, 2005
Cerebral Cortex 2006 16(10):1389-1417; doi:10.1093/cercor/bhj076
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© The Author 2005. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

Cortical Connections of the Inferior Parietal Cortical Convexity of the Macaque Monkey

Stefano Rozzi, Roberta Calzavara1, Abdelouahed Belmalih, Elena Borra, Georgia G. Gregoriou2, Massimo Matelli and Giuseppe Luppino

Dipartimento di Neuroscienze, Sezione di Fisiologia, Università di Parma, I-43100 Parma, Italy, 1 Current address: Department of Pharmacology and Physiology, School of Medicine and Dentistry, University of Rochester, Rochester, NY, USA, 2 Current address: Laboratory of Neuropsychology, NIMH, NIH, Bethesda, MD, USA

Address correspondence to Prof. Giuseppe Luppino, Dipartimento di Neuroscienze, Sezione di Fisiologia, Università di Parma, Via Volturno 39, I-43100 Parma, Italy. Email: luppino{at}unipr.it.

We traced the cortical connections of the 4 cytoarchitectonic fields—Opt, PG, PFG, PF—forming the cortical convexity of the macaque inferior parietal lobule (IPL). Each of these fields displayed markedly distinct sets of connections. Although Opt and PG are both targets of dorsal visual stream and temporal visual areas, PG is also target of somatosensory and auditory areas. Primary parietal and frontal connections of Opt include area PGm and eye-related areas. In contrast, major parietal and frontal connections of PG include IPL, caudal superior parietal lobule (SPL), and agranular frontal arm-related areas. PFG is target of somatosensory areas and also of the medial superior temporal area (MST) and temporal visual areas and is connected with IPL, rostral SPL, and ventral premotor arm- and face-related areas. Finally, PF is primarily connected with somatosensory areas and with parietal and frontal face- and arm-related areas. The present data challenge the bipartite subdivision of the IPL convexity into a caudal and a rostral area (7a and 7b, respectively) and provide a new anatomical frame of reference of the macaque IPL convexity that advances our present knowledge on the functional organization of this cortical sector, giving new insight into its possible role in space perception and motor control.

Key Words: area 7a • area 7b • dorsal visual stream • space coding • visuomotor transformations


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