Learn More
Cell genesis in the subgranular zone of the dentate gyrus of 2-month-old rabbits has been investigated. After incorporation of tritiated thymidine, electron microscopic autoradiography allowed description of the ultrastructure of the cells labelled and the progressive transformation of these cells into granular neurons to be followed. Quantitative(More)
Most of the clinical and research reports agree about the analgesic effects of dorsal column (DC) stimulation, but there is no unanimity about the neural mechanisms involved in this stimulation. The aim of the present study was to compare the effects of segmental and rostral activation of the DCs and to investigate whether these effects are mediated through(More)
Toluidine blue-stained semithin sections and Cajal-Castro preparations are used to study in rat fetuses whether oculomotor neuroblasts migrate across the midline at a certain period of development. In confirmation of previous studies, a group of oculomotor neuroblasts was detected which first grow cytoplasmic processes into the mesencephalic midline, and(More)
Adult rabbits were subjected to 4.5 Gy of whole-blody or brain alone gamma-irradiation, and their hippocampus was examined with the light and electron microscope. Pycnotic cells were found at the base of the granular layer of the dentate gyrus in the so-called subgranular zone, as soon as 3 h after irradiation, and were cleared up by active phagocytosis(More)
Neuroretinas from 6--7 day-old chick embryos were cultivated after trypsin dissociation as monolayer cultures in Petri dishes, and examined after various intervals of time with the electron microscope. Soon after plating, cells begin to reaggregate in small clumps, and typical rosettes are formed. During the first week in vitro, cells appear to(More)
Abstract To obtain a purified population of pituicytes, pieces of rat neural lobes were dissected free of the pars intermedia, incubated in a variety of media, and fixed at regular intervals between 7 and 56 days of incubation. Many neurosecretory axons survived for up to 21 days without any apparent signs of degeneration. Most axons, however, degenerated(More)
The development of neurophysin-oxytocin and neurophysin-vasopressin containing neurons of the guinea pig was studied in vitro. Supraoptic (SO) and paraventricular (PV) nuclei were explanted from guinea pig foetuses at the 40th day of gestation and cultured in Maximov slides for nearly fifty days. The cultures were observed daily under a phase-contrast(More)
The cerebellum of weaver mouse is characterized by an extensive reorganization of cell interaction secondary to the absence of mature granule cells. One yet undescribed modality of reorganization found in the hemispheres of 1-month-old animals consisted in the presence of dendro-dendritic pentalaminar junctions. The possible formation of these junctions by(More)
  • 1