PMID- 1430323 OWN - NLM STAT- MEDLINE DCOM- 19921204 LR - 20151119 IS - 0021-9967 (Print) IS - 0021-9967 (Linking) VI - 323 IP - 4 DP - 1992 Sep 22 TI - Time of origin of cortico-collicular projection neurons in the rat visual cortex. PG - 570-6 AB - The time of origin and the radial gradient of neurogenesis of cortico-collicular neurons have been studied in the rat visual area 17. We used a combined technique for the histochemical detection of the retrogradely transported horseradish peroxidase from the superior colliculus and the autoradiographic detection of the [3H]-thymidine administered during the gestational period. The cortico-collicular neurons of visual area 17 are located in layer V and are generated on gestational day (GD) 15 (59.78%), GD 16 (36.21%), and GD 17 (4.01%). This finding reveals that, for the cortico-collicular neuronal population, the birth date is well-correlated with the laminar position in the adult animal. To see whether the cortico-collicular neurons located at various radial levels of layer V are generated concurrently, or whether they follow an "inside-out" pattern of positioning, we divided layer V into three (upper, middle and lower) sublaminae. Most cortico-collicular neurons located in the lower two-thirds of layer V are generated on GD 15 (65%), whereas the neurons located in the upper third of the layer are generated both on GD 15 and GD 16 in almost equal proportions (52.53% and 44.39%, respectively). FAU - Contamina, P AU - Contamina P AD - Departamento de Ciencias Morfologicas, Facultad de Medicina, Universidad de Zaragoza, Spain. FAU - Boada, E AU - Boada E LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - United States TA - J Comp Neurol JT - The Journal of comparative neurology JID - 0406041 RN - EC 1.11.1.- (Horseradish Peroxidase) RN - VC2W18DGKR (Thymidine) SB - IM MH - Animals MH - Female MH - Histocytochemistry MH - Horseradish Peroxidase MH - Neurons/*physiology MH - Pregnancy MH - Rats MH - Rats, Wistar MH - Superior Colliculi/*physiology MH - Thymidine MH - Visual Cortex/cytology/growth & development/*physiology MH - Visual Pathways/cytology/growth & development/physiology EDAT- 1992/09/22 00:00 MHDA- 1992/09/22 00:01 CRDT- 1992/09/22 00:00 PHST- 1992/09/22 00:00 [pubmed] PHST- 1992/09/22 00:01 [medline] PHST- 1992/09/22 00:00 [entrez] AID - 10.1002/cne.903230409 [doi] PST - ppublish SO - J Comp Neurol. 1992 Sep 22;323(4):570-6. doi: 10.1002/cne.903230409.