Results 161 to 170 of about 200,890 (206)
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Regionalisation and acquisition of polarity in the optic tectum
Progress in Neurobiology, 2001The optic tectum differentiates from the alar plate of the mesencephalon and receives retinal fibres in a precise retinotopic manner. Here, mechanisms of tectum polarisation and regionalisation are reviewed. Misexpression of Pax2, Pax5 or En can change the fate of the presumptive diencephalon to that of the tectum.
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Axonal transport of proteoglycans to the goldfish optic tectum
Neurochemical Research, 1988The study addressed the question of whether 35SO4 labeled molecules that have been delivered to the goldfish optic nerve terminals by rapid axonal transport include soluble proteoglycans. For analysis, tectal homogenates were subfractionated into a soluble fraction (soluble after centrifugation at 105,000 g), a lysis fraction (soluble after treatment ...
J A, Ripellino, J S, Elam
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Lineage of radial glia in the chicken optic tectum
Development, 1992ABSTRACT In many parts of the central nervous system, the elongated processes of radial glial cells are believed to guide immature neurons from the ventricular zone to their sites of differentiation. To study the clonal relationships of radial glia to other neural cell types, we used a recombinant retrovirus to label precursor cells in ...
G E, Gray, J R, Sanes
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Contrast sensitivity of neurons in pigeon optic tectum
Brain Research, 1981An analysis of contrast sensitivity of neurons in the optic tectum of intact and wulst-ablated pigeons was carried out using moving light bars. (1) Changes of contrast from 0.1% to 89%, obtained with different bar luminances, induced increases of response amplitude linearly related to log contrast. (2) The units differed in their contrast threshold but
BAGNOLI, PAOLA +2 more
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Synaptic junctions in the developing chick optic tectum
Experientia, 1973Giunzioni sinaptiche compaiono in differenti strati plessiformi del tetto ottico dell'embrione di pollo, a partire dal 120 giorno di incubazione: aumentano di numero fra il 12o ed il 18o giorno e, in maniera critica, fra questo e le prime ore dopo la schiusa.
D, Cantino, L, Sisto Daneo
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Projections of the optic tectum in two teleost species
Journal of Comparative Neurology, 1976AbstractThe efferent pathways of the optic tectum have been investigated in the percomorph Eugerres and the berycomorph Holocentrus. A portion of the dorsal‐dorsolateral region of the optic tectum was unilaterally resected by suction. The animals were perfused 6–30 days thereafter, and the brains were processed according to a modification (Method 7 in ...
S O, Ebbesson, H, Vanegas
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Responses of the Optic Tectum to Telencephalic Stimulation in Catfish
Brain, Behavior and Evolution, 2008In order to test physiologically for cerebrotectal connections in a fish, averaged evoked potentials and unit responses were recorded from the optic tectum following electrical stimulation applied to the telencephalon in the siluroid teleost Ictalurus nebulosus.
L T, Lee, T H, Bullock
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Muscarinic action of acetylcholine in the pigeon optic tectum
Experimental Neurology, 1986Eighty visual units were extracellularly recorded from the pigeon optic tectum, and the effects of iontophoretically applied acetylcholine and its antagonists, atropine and tubocurarine, on these units were examined. The results showed that acetylcholine in the avian tectum functions as an excitatory transmitter or modulator and acts predominantly ...
S R, Wang, Z, Li, H Y, Xu
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Neuroglia in the optic tectum of teleosts.
Journal fur Hirnforschung, 1989The morphology of the neuroglial cells of the optic tectum of Cyprinid teleosts (Cyprinus carpio and Barbus bocagei) was analyzed using two variants of the Golgi method (Colonnier and Meyer) and electron microscopy. Although the description of the results is based on the three classical neuroglial types (ependymocytes, astrocytes and oligodendrocytes),
J M, Lara +4 more
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Effects of embryonic overgrowth on the avian optic tectum
American Journal of Anatomy, 1972AbstractThe effects of embryonic overgrowth on the avian optic tectum were determined during late developmental stages in 121 chick embryos in which overgrowth was induced surgically. The embryos ranged in incubation age from seven days through 21 days and showed a variety of gross brain defects, including fused optic lobes, fusion of one or both optic
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