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  • 1
    Electronic Resource
    Electronic Resource
    An analysis of postsynaptic potentials of tectal neurons of the frog: correlation with impulses recorded from the terminals of retinotectal afferents (1988)
    Springer
    Experimental brain research 70 (1988), S. 429-432 
    Details
    ISSN: 1432-1106
    Keywords: Optic tectum ; Frog ; Monosynaptic activation ; “On-off” retinal fiber ; Pulse-analogue correlation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The purpose of this study is to examine the synaptic action between terminals of retinal ganglion cell axons and tectal neurons. To accomplish this, an extracellular single unit identified as retinotectal fiber was first isolated from the superficial layer of the optic tectum and intracellular responses were recorded from a tectal neuron in the vicinity of the extracellular recording electrode. “On-off” retinal fibers and both E-E (EPSP at “on” and “off” of diffuse light) and EI-EI type (EPSP-IPSP combination at “on” and “off” of diffuse light) tectal neurons were selected for the pre- and postsynaptic pair. Postsynaptic responses to a small moving square were averaged by triggering with the isolated presynaptic impulses. The latency of the resultant EPSPs indicated that most of the E-E and EI-EI type tectal neurons were monosynaptically activated by “on-off” retinal fibers. One of the E-E type tectal neurons was identified as a large ganglionic neuron in layer 8.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00248367
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Osmotic pressure of the interstitial fluid obtained from neonatal chick eyes and its variation under light and dark adaptation (1985)
    Springer
    Documenta ophthalmologica 61 (1985), S. 79-89 
    Details
    ISSN: 1573-2622
    Keywords: adaptation ; aqueous humor ; electroretinogram ; intraocular fluids ; osmolarity ; vitreous humor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In experiments by Yoneyama et al. (1985) a hypertonic perfusing solution was used to record the c-wave from the isolated chick retina. We investigated whether the chick retina was surrounded by such hypertonic liquids. The following results were found: (1) the osmolarity of the subchoroidal humor was markedly higher than that of fluids from other areas of the eye; (2) the relative difference in osmolarity between both sides of the retina was 110–170 mOsmol in the light-adapted condition, whereas it was about 270 mOsmol in the dark-adapted condition; and (3) in the dark-adapted state the volume of the subchoroidal humor decreased about 40% but increased in osmolarity about 30–40%, whereas osmolarity of the subviteous humor decreased about 15–20 mOsmol. Results suggest the presence of an inward-directed pump mechanism for watersoluble components in the retina in addition to the proposed outward-directed pump mechanism of the pigment epithelium. The inward-directed pump may be more active in the dark-adapted state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00143219
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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