Do superior colliculus projection zones in the inferior pulvinar project to MT in primates?
Article first published online: 27 AUG 2008
European Journal of Neuroscience
Volume 11, Issue 2, pages 469 –480, February 1999
How to Cite
Stepniewska, I., Qi, H.-X. and Kaas, J. H. (1999), Do superior colliculus projection zones in the inferior pulvinar project to MT in primates?. European Journal of Neuroscience, 11: 469 –480. doi: 10.1046/j.1460-9568.1999.00461.x
- Issue published online: 27 AUG 2008
- Article first published online: 27 AUG 2008
- Received 20 May 1998, revised 7 September 1998, accepted 10 September 1998
- ascending projection;
- extrastriate cortex;
- lateral geniculate nucleus;
- posterior thalamus
In order to determine the relationship of superior colliculus inputs to thalamic neurons projecting to the middle temporal visual area (MT), injections of wheat germ agglutinin conjugated with horseradish peroxidase were placed in the superior colliculus of three owl monkeys, with injections of Fast Blue in the MT. The locations of labelled terminals and neurons in the posterior thalamus were related to four architectonically distinct nuclei of the inferior pulvinar (Stepniewska & Kaas, Vis. Neurosci.14, pp.1043–1060, 1997). Fast Blue injections in the MT labelled neurons largely in the medial nucleus of the inferior pulvinar. A few labelled neurons were found in the adjoining central medial nucleus of the inferior pulvinar, as well as in the lateral pulvinar and the dorsal lateral geniculate nucleus. Superior colliculus inputs were most dense in the posterior and medial nuclei of the inferior pulvinar. There were sparser inputs to the central lateral nucleus of the inferior pulvinar, locations in the lateral and medial pulvinar, and the dorsal lateral geniculate nucleus. The results indicate that the medial nucleus of the inferior pulvinar, the major projection zone to the MT, does not receive a significant input from the superior colliculus.