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image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Cell and Tissue Rese...arrow_drop_down
image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
Cell and Tissue Research
Article . 1968 . Peer-reviewed
License: Springer TDM
Data sources: Crossref
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Retina und Retinomotorik der Dipnoi und Brachiopterygii

Authors: Wolfgang Pfeiffer;

Retina und Retinomotorik der Dipnoi und Brachiopterygii

Abstract

1. Das Auge, insbesondere die Retina von Calamoichthys calabaricusJ. A. Smith, Polypterus delheziBoulenger (Polypteridae, Polypteriformes, Brachiopterygii) und von Protopterus dolloiBoulenger (Protopteridae, Lepidosireniformes, Dipnoi) wurde lichtmikroskopisch untersucht. Die Zahl der Seh- und Ganglienzellen wurde uberschlagsweise berechnet. Ferner wurde gepruft, ob eine Retinomotorik vorhanden ist. 2. Das Auge der Polypteridae entspricht dem der Teleostei, das Auge von Protopterus ahnelt eher dem Auge der Urodela. 3. Die Retina der Polypteridae ist pigmentarm. 5–7 Sehzellen treffen auf 1 Ganglienzelle. Polypterus besitzt Stabchen und Zapfen, Calamoichthys nur Zapfen. Ein 18 cm langer Polypterus hat einen Augendurchmesser von 7 mm und besitzt in einem Auge etwa 1,5 Millionen Sehzellen. Ein 30 cm langer Calamoichthys hat einen Augendurchmesser von 2,3 mm und etwa 130000 Zapfen. 4. Die pigmentreiche Retina von Protopterus enthalt riesige Stabchen, einfache Zapfen und Doppelzapfen. Das Auge eines 30 cm langen Exemplares mist 2 mm im Durchmesser und enthalt 40000 Sehzellen. 2–3 Sehzellen treffen auf 1 Ganglienzelle. 5. Wahrend das Auge von Polypterus bei dem Beutefang und bei der Feindvermeidung eine Rolle spielen kann, hat das Auge im Leben von Calamoichthys und besonders von Protopterus dolloi anscheinend nur eine untergeordnete Bedeutung. 6. Die Lage der Sehzellen und die Verteilung des Pigmentes sind bei Polypterus, Calamoichthys und Protopterus konstant und von den Lichtverhaltnissen und dem Tageslauf unabhangig. Den Brachiopterygii und den Lepidosireniformes fehlt eine Retinomotorik.

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
21
Average
Top 10%
Top 10%
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