BAMS | Cell details

For many cells of types CB₅-CB₉, kainate did not evoke a short-latency response, but indirectly mediated responses were sometimes observed during longer-lasting application of kainate. These indirect responses were slow in onset, reversed close to and followed changes in E_Cl, and could be blocked by a combination of picrotoxin and 3-APMPA. These characteristics were identical to those described above for OFF cone bipolar cells and to those observed previously for rod bipolar cells (Hartveit 1996b). In addition, a few cells responded to kainate with an outward current at -70 mV, typical for APB-like responses. On the basis of these results, one would expect that CB₅-CB₉do not express functional (conductance increasing) ionotropic glutamate receptors and therefore would correspond physiologically to ON cone bipolar cells.

is included

...some cells (among CB5-CB9) did not display short-latency responses to kainate. Other cells of the same types (CB5-CB8), however, displayed short-latency kainate responses, but the evoked current either could not be reversed or reversed at positive potentials. I propose that these cells (CB5-CB9) are ON cone bipolar cells and that the short-latency kainate responses are mediated via gap junctions with AII amacrine cells.

Hartveit E.

Mihail Bota

type 6a bipolar cell

Ivanova and Muller (IM)

We recorded from two bipolar cells that stratified directly below the ON-cholinergic stratum. One cell type had an axon terminal system with large lateral extension. The shape of this cell and the stratification of its axon terminal closely resemble those of type 6 cells described by Euler and Wassle (1995) and Hartveit (1997). Further on, these cells with called type 6a cells (Fig. 1b).

synonim

The shape of this cell and the stratification of its axon terminal closely resemble those of type 6 cells described by Euler and Wassle (1995) and Hartveit (1997).

Ivanova E. & Muler F.

Mihail Bota