Results 171 to 180 of about 8,639 (218)

Muscarinic action of acetylcholine in the pigeon optic tectum

Experimental Neurology, 1986
Eighty 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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The optic tectum of Calamoichthys calabaricus smithi

Cell and Tissue Research, 1977
The optic tectum of Calamoichthys calabaricus (Polypteriformes) shows a relatively complex vertical stratification, with six main layers and a varied neuronal typology. In particular, pyriform neurons in the well developed stratum griseum periventriculare and some multipolar neurons in the stratum griseum profundum represent the efferent elements of ...
V, Mazzi, A, Fasolo, M F, Franzoni
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Lineage of radial glia in the chicken optic tectum

Development, 1992
ABSTRACT 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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Synaptic junctions in the developing chick optic tectum

Experientia, 1973
Giunzioni 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, 1976
AbstractThe 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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Neuroglia in the optic tectum of teleosts.

Journal fur Hirnforschung, 1989
The 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, J R, Alonso, E, Vecino, R, Coveñas, J, Aijon   +4 more
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Localized unit responses in the optic tectum of carp

Vision Research, 1973
Abstract Temporal properties of single unit responses were correlated with the position of the recording electrode in the carp optic tectum. ON, OFF and ON-OFF visual units were encountered. Lesions corresponding to these units were found in all layers of the tectum with the exception of the periventricular gray (stratum griseum periventriculare ...
T, Ramstad, G W, Hughes
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Responses of the Optic Tectum to Telencephalic Stimulation in Catfish

Brain, Behavior and Evolution, 2008
In 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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Kainic Acid Toxicity and Binding in the Optic Tectum

1979
Publisher Summary Kainic acid, a conformationally restricted glutamate derivative, may be helpful to characterize neurons using glutamate as neurotransmitter. Biochemical, histological, and physiological evidence in the central nervous system indicate a close relation between the neuronal effects of glutamate and kainic acid.
H, Henke, P, Streit, J C, Reubi, M, Cuénod   +3 more
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Anatomy and Synaptology of the Optic Tectum

1973
After decussation in the chiasma the optic fibres become segregated to form the accessory optic tract and the main or marginal optic tract. The anterior part of the accessory optic tract is supposed to connect the retina with subthalamic and dorsal hypothalamic nuclei [45].
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