Abstract
The lateral premotor cortex plays a crucial role in visually guided limb movements. Visual information may reach this cortical region from the parietal cortex, the highest stage in the dorsal visual stream. Anatomical studies indicate that the parietal projections to the dorsal (PMd) and ventral (PMv) premotor areas arise from separate parietal regions, supporting the notion of parallel visuomotor pathways. We tested the degree of segregation of these pathways by injecting retrograde tracers into PMd and PMv in the same monkeys, under physiological control. Eleven injections were made in four animals, and the analysis of retrograde labelling revealed that parietal cells projecting to PMd and those projecting to PMv are largely segregated. The strongest projections to PMd arise from the superior parietal lobule, including the medial intraparietal area (MIP), PEc and PGm, and the parieto-occipital area. These areas were devoid of labelling following injections into PMv, which receives its major projections from the anterior intraparietal area (AIP), area PEip, the anterior portion of the inferior parietal gyrus (area 7b), and the somatosensory areas. In addition to their strong projections to PMv, areas 7b and PEip send minor projections to PMd as well. Additional projections to PMd arise from the ventral intraparietal area and the inferior parietal lobule. The present findings are direct anatomical evidence for largely segregated visuomotor pathways linking parietal cortex with PMd and PMv.
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Abbreviations
- AIP :
-
anterior intraparietal area
- DLPF :
-
dorsolateral prefrontal cortex
- FST :
-
area of the fundus of the superior temporal sulcus
- IPL :
-
inferior parietal lobule
- LIP :
-
lateral intraparietal area
- LIPd, LIPv :
-
dorsal and ventral parts of the lateral intraparietal area, respectively
- M1 :
-
primary motor area
- Med. Par. :
-
medial parietal cortex
- MIP :
-
medial intraparietal area
- MST :
-
medial superior temporal area
- MT :
-
middle temporal area
- PEc, PGm :
-
nomenclature used by Pandya and Seltzer (1982)
- PEip :
-
intraparietal part of PE (Matelli et al. 1998)
- PMd :
-
dorsal premotor area
- PMdc, PMdr :
-
caudal and rostral part of the dorsal premotor area, respectively
- PMv :
-
ventral premotor area
- PMvc, PMvr :
-
caudal and rostral parts of the ventral premotor area, respectively
- PO :
-
parieto-occipital area
- Post-cent. :
-
postcentral gyrus
- PP :
-
posterior parietal area
- SI, SII :
-
primary and secondary somatosensory areas
- SPL :
-
superior parietal lobule
- STP :
-
superior temporal polysensory area
- TE :
-
temporal area
- TEO :
-
temporo-occipital area
- VIP :
-
ventral intraparietal area
- VLPF :
-
ventrolateral prefrontal cortex
- ar :
-
arcuate
- ce :
-
central
- ci :
-
cingulate
- ip :
-
IPs, intraparietal
- la :
-
lateral
- lu :
-
lunate
- pc :
-
postcentral
- pos :
-
parieto-occipital
- pom :
-
medial branch of parieto-occipital
- pr :
-
principal
- spc :
-
superior precentral
- st :
-
superior temporal
- CB :
-
subunit B of choleratoxin
- D :
-
dorsal
- DY :
-
diamidino yellow
- FB :
-
fast blue
- FR :
-
fluoro ruby
- ICMS :
-
intracortical microstimulation
- M :
-
medial
- R :
-
rostral
- WGA :
-
wheat germ agglutinin
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This study was supported by INSERM (Paris), the Swiss National Science Foundation (grant nos. 3130-025138, 31-28572.90 and 31-43422.95 for E.M.R.), the European Community (Biomed 2/n-BMH4-CT95-0789 for D.B.), and The National Centre of Competence in Research (NCCR) on Neural Plasticity and Repair (E.M.R.)
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Tanné-Gariépy, J., Rouiller, E.M. & Boussaoud, D. Parietal inputs to dorsal versus ventral premotor areas in the macaque monkey: evidence for largely segregated visuomotor pathways. Exp Brain Res 145, 91–103 (2002). https://doi.org/10.1007/s00221-002-1078-9
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DOI: https://doi.org/10.1007/s00221-002-1078-9