Proliferative activity of the ependyma, lining the recessus praeopticus in juvenile frogs was studied with 3H-thymidine radioautography. Usually much more pronounced proliferation of ependymal cells occurred in the preoptic region in one year old frogs as compared with two year old ones. It can be concluded that in the former animals the migration of postmitotic labeled cells into the subependymal zone of the recessus preoptic area is significantly more intense. By the 30th day after multiple isotope injections some newly formed neurosecretory cells with labeled nuclei were found in the 1-5 cellular position of the recessus praeopticus subependymal zone. It is postulated that in juvenile frogs the ependyma of lateral wall of recessus praeopticus is probably a source ("cambium"), from which some young neurosecretory cells may originate.
Download full-text PDF |
Source |
|---|
Publication Analysis
Top Keywords
Similar Publications
Localization of the neuronal form of nitric oxide synthase (bNOS) in the diencephalon and pituitary gland of the catfish, Synodontis multipunctatus: an immunocytochemical study.
Gen Comp Endocrinol
June 2003
Department of Anatomy and Embryology, School of Medicine, University of Goettingen, Kreuzbergring 36, D-37075 Goettingen, Germany.
The distribution of the neuronal form of nitric oxide synthase (bNOS) was investigated in the brain and pituitary gland of the catfish, Synodontis multipunctatus. Immunoreactive neurons were found mainly in the nucleus praeopticus periventricularis, the parvocellular and supraoptic subdivisions of the nucleus praeopticus, the nucleus recessus lateralis and the nucleus recessus posterioris. In addition, some scattered bNOS labeled somata were noted in the dorsal hypothalamic area.
View Article and Find Full Text PDFDevelopment of tyrosine hydroxylase-immunoreactive systems in the brain of the larval lamprey Lampetra fluviatilis.
J Comp Neurol
May 2002
Institut National de la Santé et de la Recherche Médicale U-106, Hôpital de la Salpêtrière, 75013 Paris, France.
The development of the catecholaminergic system of the brain of the lamprey (Lampetra fluviatilis) was studied with immunocytochemistry in a series of larvae of different sizes by using two different antibodies directed against tyrosine hydroxylase (TH), the rate-limiting enzyme of catecholamine synthesis. In group 1 larvae (length: 29-54 mm, ages: 8 months to 1.5 years), the only TH-immunoreactive somata observed were located in the caudal wall of the recessus praeopticus (RP) and in the nucleus tuberculi posterioris (NTP).
View Article and Find Full Text PDFNADPH-diaphorase expression in the hypothalamo-hypophysial system of different catfish.
J Hirnforsch
June 2000
Department of Neuroanatomy, Center of Anatomy, School of Medicine, University of Goettingen, Germany.
The distribution of NADPH-d activity was studied in the hypothalamus and in the pituitary gland of 15 species of catfish. Seven hypothalamic nuclei, four fiber bundles, as well as cells located in the adenohypophysis were labeled by NADPH-d histochemistry. Reactive somata were found in the nucleus praeopticus periventricularis, the paraventricular division of the nucleus praeopticus, the supraoptic division of the nucleus praeopticus, the nucleus lateralis tuberis, the paraventricular organ, the nucleus recessus lateralis, the nucleus recessus posterioris, and in the adenohypophysis.
View Article and Find Full Text PDFFMRFamide immunoreactivity in the brain and pituitary of Carassius auratus (Cyprinidae, Teleostei).
J Hirnforsch
August 1989
Institute for Anatomy, University of Regensburg, FRG.
Neurons immunoreactive for the molluscan cardioactive peptide FMRFamide (FMRFi) in the brain of Carassius were demonstrated immunohistochemically with the peroxidase-antiperoxidase technique (PAP) and three antisera against this tetrapeptide. FMRFi perikarya were consistently found in the ganglion of the nervus terminalis, in some scattered neurons of the nucleus entopeduncularis, in the nucleus praeopticus pars magno- and parvocellularis, the nucleus ventromedialis, the nucleus posterior periventricularis, nucleus recessus lateralis and posterior. Some weak FMRFi neurons occurred in the rostral mesencephalic tegmentum and in the region of the nucleus gustatorius secundus.
View Article and Find Full Text PDFFMRFamide-like immunoreactivity in brain and pituitary of Xenotaca eisenii: (Ciprinidontoformes, Teleostei).
J Hirnforsch
September 1988
Institute for Anatomy, University of Regensburg, FRG.
FMRFamide-immunoreactive neurons were determined immunocytochemically by means of the PAP-technique for unlabeled antibodies. FMRFamide-containing perikarya were found in the frontoventral telencephalon, in the valvula and corpus cerebelli, and in the rostral and caudal medulla oblongata. FMRFamide immunoreactive cells were localized in the anterio lobe of the pituitary.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!