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The visual system of the channel catfish ( ictalurus punctatus ). I. Retinal ganglion cell morphology
Author(s) -
DunnMeynell A. A.,
Sharma S. C.
Publication year - 1986
Publication title -
journal of comparative neurology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.855
H-Index - 209
eISSN - 1096-9861
pISSN - 0021-9967
DOI - 10.1002/cne.902470103
Subject(s) - inner plexiform layer , giant retinal ganglion cells , bistratified cell , soma , biology , anatomy , dendrite (mathematics) , retina , ganglion , intrinsically photosensitive retinal ganglion cells , axon , neuroscience , parasol cell , horseradish peroxidase , retinal waves , inner nuclear layer , catfish , retinal ganglion cell , biochemistry , geometry , mathematics , fishery , fish <actinopterygii> , enzyme
Horseradish peroxidase was applied to lesions in the optic nerve of catfish (Ictalurus punctatus). The retinae were processed to reveal HRP‐labelled ganglion cells. The histochemical techniques employed allowed fine details of the dendritic arbor to be resolved. Flat‐mounted retinae were examined and the following characteristics were noted in individual ganglion cells: Soma area, shape, and depth; number and diameter of major dendrites; shape, area, and depth(s) within the inner plexiform layer (ipl) of the dendritic arbor; origin of the axon (from the soma or a dendrite). On the basis of these characteristics, eleven classes of ganglion cells were delineated: four classes of giant cells (Gl‐G4) and seven classes of smaller cells (Sl‐S7). G1 cells had dendrites arborizing in the most distal sublamina of the ipl. G1 cells in the dorsal retina had nasotemporally elongated dendritic arbors. G2 cells had dendrites in the proximal portion of the ipl. G3 cells were almost completely confined to a band running between the nasal and temporal retinal poles, through the center of the retina. In this location, the cells had dorsoventrally elongated dendritic arbors, which were bistratified in the ipl. G4 cells were displaced into the inner nuclear layer. S1 and S4 cells had axons arising from their somata, and dendrites arborizing in the distal and the proximal ipl, respectively. S2 cells were typified by their unstratified dendritic arbors. Similarly, S3 cells were characterised by their bistratified arbors. S5 cells arborized in the most proximal ipl sublamina. S6 cells were small ganglion cells with their somata lying in the inner nuclear layer. S7 cells tended to have complex dendritic arbors, and their axons arose from dendrites.