Expression and Function of the Endocannabinoid System in the Retina and the Visual Brain

Table 2

Cannabinoid receptor type 1 protein distribution in the adult retina of various species.

Retinal cells
Photoreceptors	Expression in the inner [17, 56] and outer segments [22]; Strong labeling in the cone pedicles [17, 51, 53, 56, 78]
Horizontal cells	Expression in the membrane but not in dendrites [17, 51, 56]
Bipolar cells	Expression in the dendrites, cell body, and axons of rod bipolar cells [17, 51]
Amacrine cells	Expression in amacrine cells, including GABAergic amacrine cells [17, 51, 56, 65]
Inner plexiform layer	Unspecified expression in the IPL [17, 22, 53]; Expression in the synapses of rod bipolar cells [51]; Higher expression in the synapses of ON cone bipolar cells compared to OFF cone bipolar cells [78]
Ganglion cells	Expression in the cell body and fibers [17, 22, 53, 56, 83]
Müller cells	Absence of expression [17, 53, 56]; Expression in the goldfish retina only [78]